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28421000388 = 22341197229359
BaseRepresentation
bin11010011110000001…
…100000110011000100
32201100201010102010000
4122132001200303010
5431201234003023
621020104401300
72024204342304
oct323601406304
981321112100
1028421000388
1111064a06280
125612176230
1328ac202bc1
14153885d604
15b151c7243
hex69e060cc4

28421000388 has 240 divisors, whose sum is σ = 82474761600. Its totient is φ = 8462776320.

The previous prime is 28421000383. The next prime is 28421000417. The reversal of 28421000388 is 88300012482.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28421000383) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 79166953 + ... + 79167311.

It is an arithmetic number, because the mean of its divisors is an integer number (343644840).

Almost surely, 228421000388 is an apocalyptic number.

28421000388 is the 106623-rd heptagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28421000388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41237380800).

28421000388 is an abundant number, since it is smaller than the sum of its proper divisors (54053761212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28421000388 is a wasteful number, since it uses less digits than its factorization.

28421000388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The spelling of 28421000388 in words is "twenty-eight billion, four hundred twenty-one million, three hundred eighty-eight", and thus it is an aban number.