28915197909 has 32 divisors (see below), whose sum is σ = 42539333760. Its totient is φ = 17357856768.

The previous prime is 28915197907. The next prime is 28915197911. The reversal of 28915197909 is 90979151982.

It is an interprime number because it is at equal distance from previous prime (28915197907) and next prime (28915197911).

It is not a de Polignac number, because 28915197909 - 2¹ = 28915197907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28915197907) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1346037 + ... + 1367349.

It is an arithmetic number, because the mean of its divisors is an integer number (1329354180).

Almost surely, 2^28915197909 is an apocalyptic number.

It is an amenable number.

28915197909 is a deficient number, since it is larger than the sum of its proper divisors (13624135851).

28915197909 is a wasteful number, since it uses less digits than its factorization.

28915197909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22181.

The product of its (nonzero) digits is 3674160, while the sum is 60.

The spelling of 28915197909 in words is "twenty-eight billion, nine hundred fifteen million, one hundred ninety-seven thousand, nine hundred nine".