28291538516 has 96 divisors (see below), whose sum is σ = 56132600832. Its totient is φ = 12404367360.

The previous prime is 28291538477. The next prime is 28291538521. The reversal of 28291538516 is 61583519282.

It is a super-2 number, since 2×28291538516² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17714630 + ... + 17716226.

It is an arithmetic number, because the mean of its divisors is an integer number (584714592).

Almost surely, 2^28291538516 is an apocalyptic number.

It is an amenable number.

28291538516 is a deficient number, since it is larger than the sum of its proper divisors (27841062316).

28291538516 is a wasteful number, since it uses less digits than its factorization.

28291538516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1929 (or 1927 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 50.

The spelling of 28291538516 in words is "twenty-eight billion, two hundred ninety-one million, five hundred thirty-eight thousand, five hundred sixteen".