28078748700 has 216 divisors, whose sum is σ = 88643774352. Its totient is φ = 6855966720.

The previous prime is 28078748699. The next prime is 28078748741. The reversal of 28078748700 is 784787082.

It is a super-2 number, since 2×28078748700² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3203524 + ... + 3212276.

Almost surely, 2^28078748700 is an apocalyptic number.

28078748700 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 28078748700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44321887176).

28078748700 is an abundant number, since it is smaller than the sum of its proper divisors (60565025652).

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

28078748700 is a wasteful number, since it uses less digits than its factorization.

28078748700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8841 (or 8817 counting only the distinct ones).

The product of its (nonzero) digits is 1404928, while the sum is 51.

The spelling of 28078748700 in words is "twenty-eight billion, seventy-eight million, seven hundred forty-eight thousand, seven hundred".