28006691904 has 189 divisors, whose sum is σ = 84955039767. Its totient is φ = 8820119808.

The previous prime is 28006691861. The next prime is 28006691941. The reversal of 28006691904 is 40919660082.

It is a happy number.

The square root of 28006691904 is 167352.

It is a perfect power (a square), and thus also a powerful number.

It is a self number, because there is not a number n which added to its sum of digits gives 28006691904.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 76312329 + ... + 76312695.

Almost surely, 2^28006691904 is an apocalyptic number.

28006691904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

28006691904 is the 167352-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28006691904

28006691904 is an abundant number, since it is smaller than the sum of its proper divisors (56948347863).

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

28006691904 is an equidigital number, since it uses as much as digits as its factorization.

28006691904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790 (or 391 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 28006691904 in words is "twenty-eight billion, six million, six hundred ninety-one thousand, nine hundred four".