28990215788 has 24 divisors (see below), whose sum is σ = 51431033472. Its totient is φ = 14296656384.

The previous prime is 28990215769. The next prime is 28990215799. The reversal of 28990215788 is 88751209982.

It is a super-2 number, since 2×28990215788² (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 (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13820 + ... + 241187.

It is an arithmetic number, because the mean of its divisors is an integer number (2142959728).

Almost surely, 2^28990215788 is an apocalyptic number.

It is an amenable number.

28990215788 is a deficient number, since it is larger than the sum of its proper divisors (22440817684).

28990215788 is a wasteful number, since it uses less digits than its factorization.

28990215788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255401 (or 255399 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 59.

The spelling of 28990215788 in words is "twenty-eight billion, nine hundred ninety million, two hundred fifteen thousand, seven hundred eighty-eight".