28790997237 has 32 divisors (see below), whose sum is σ = 43219008000. Its totient is φ = 18939735360.

The previous prime is 28790997233. The next prime is 28790997269. The reversal of 28790997237 is 73279909782.

It is not a de Polignac number, because 28790997237 - 2² = 28790997233 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28790997233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5075839 + ... + 5081507.

It is an arithmetic number, because the mean of its divisors is an integer number (1350594000).

Almost surely, 2^28790997237 is an apocalyptic number.

28790997237 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28790997237 is a deficient number, since it is larger than the sum of its proper divisors (14428010763).

28790997237 is a wasteful number, since it uses less digits than its factorization.

28790997237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8138 (or 8132 counting only the distinct ones).

The product of its (nonzero) digits is 24004512, while the sum is 63.

The spelling of 28790997237 in words is "twenty-eight billion, seven hundred ninety million, nine hundred ninety-seven thousand, two hundred thirty-seven".