28720577619 has 16 divisors (see below), whose sum is σ = 42769472800. Its totient is φ = 19047840768.

The previous prime is 28720577581. The next prime is 28720577629. The reversal of 28720577619 is 91677502782.

It is a happy number.

28720577619 is a `hidden beast` number, since 2 + 8 + 7 + 2 + 0 + 577 + 61 + 9 = 666.

It is not a de Polignac number, because 28720577619 - 2⁹ = 28720577107 is a prime.

It is a super-2 number, since 2×28720577619² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28720577629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2750554 + ... + 2760975.

It is an arithmetic number, because the mean of its divisors is an integer number (2673092050).

Almost surely, 2^28720577619 is an apocalyptic number.

28720577619 is a deficient number, since it is larger than the sum of its proper divisors (14048895181).

28720577619 is a wasteful number, since it uses less digits than its factorization.

28720577619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5511731 (or 5511725 counting only the distinct ones).

The product of its (nonzero) digits is 2963520, while the sum is 54.

The spelling of 28720577619 in words is "twenty-eight billion, seven hundred twenty million, five hundred seventy-seven thousand, six hundred nineteen".