28402837690 has 32 divisors (see below), whose sum is σ = 52040736144. Its totient is φ = 11158218240.

The previous prime is 28402837681. The next prime is 28402837721. The reversal of 28402837690 is 9673820482.

It can be written as a sum of positive squares in 8 ways, for example, as 16462686249 + 11940151441 = 128307^2 + 109271^2 .

It is a super-2 number, since 2×28402837690² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 378582 + ... + 447358.

Almost surely, 2^28402837690 is an apocalyptic number.

28402837690 is a deficient number, since it is larger than the sum of its proper divisors (23637898454).

28402837690 is a wasteful number, since it uses less digits than its factorization.

28402837690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69522.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The spelling of 28402837690 in words is "twenty-eight billion, four hundred two million, eight hundred thirty-seven thousand, six hundred ninety".