28720634590 has 16 divisors (see below), whose sum is σ = 53479802880. Its totient is φ = 11092107040.

The previous prime is 28720634587. The next prime is 28720634597. The reversal of 28720634590 is 9543602782.

It is a self number, because there is not a number n which added to its sum of digits gives 28720634590.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28720634597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49518046 + ... + 49518625.

It is an arithmetic number, because the mean of its divisors is an integer number (3342487680).

Almost surely, 2^28720634590 is an apocalyptic number.

28720634590 is a deficient number, since it is larger than the sum of its proper divisors (24759168290).

28720634590 is a wasteful number, since it uses less digits than its factorization.

28720634590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99036707.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 28720634590 in words is "twenty-eight billion, seven hundred twenty million, six hundred thirty-four thousand, five hundred ninety".