28078562400 has 144 divisors (see below), whose sum is σ = 104452314624. Its totient is φ = 6417953280.

The previous prime is 28078562377. The next prime is 28078562411. The reversal of 28078562400 is 426587082.

It is a happy number.

It is a hoax number, since the sum of its digits (42) 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 (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 818872 + ... + 852471.

It is an arithmetic number, because the mean of its divisors is an integer number (725363296).

Almost surely, 2^28078562400 is an apocalyptic number.

28078562400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28078562400 is an abundant number, since it is smaller than the sum of its proper divisors (76373752224).

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

28078562400 is a wasteful number, since it uses less digits than its factorization.

28078562400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671373 (or 1671360 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 42.

The spelling of 28078562400 in words is "twenty-eight billion, seventy-eight million, five hundred sixty-two thousand, four hundred".