28156014720 has 640 divisors, whose sum is σ = 109087482240. Its totient is φ = 6892978176.

The previous prime is 28156014683. The next prime is 28156014739. The reversal of 28156014720 is 2741065182.

28156014720 is a `hidden beast` number, since 2 + 8 + 1 + 5 + 601 + 47 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

It is a super-2 number, since 2×28156014720² (a number of 22 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 37894669 + ... + 37895411.

It is an arithmetic number, because the mean of its divisors is an integer number (170449191).

Almost surely, 2^28156014720 is an apocalyptic number.

28156014720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28156014720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54543741120).

28156014720 is an abundant number, since it is smaller than the sum of its proper divisors (80931467520).

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

28156014720 is a wasteful number, since it uses less digits than its factorization.

28156014720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834 (or 813 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 28156014720 in words is "twenty-eight billion, one hundred fifty-six million, fourteen thousand, seven hundred twenty".