28137612465 has 32 divisors (see below), whose sum is σ = 52197315840. Its totient is φ = 14354258688.

The previous prime is 28137612431. The next prime is 28137612467. The reversal of 28137612465 is 56421673182.

28137612465 is a `hidden beast` number, since 28 + 1 + 3 + 7 + 612 + 4 + 6 + 5 = 666.

It is not a de Polignac number, because 28137612465 - 2²⁷ = 28003394737 is a prime.

It is a super-3 number, since 3×28137612465³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28137612465.

It is not an unprimeable number, because it can be changed into a prime (28137612467) 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, 4527912 + ... + 4534121.

It is an arithmetic number, because the mean of its divisors is an integer number (1631166120).

Almost surely, 2^28137612465 is an apocalyptic number.

It is an amenable number.

28137612465 is a deficient number, since it is larger than the sum of its proper divisors (24059703375).

28137612465 is a wasteful number, since it uses less digits than its factorization.

28137612465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9062070 (or 9062064 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The spelling of 28137612465 in words is "twenty-eight billion, one hundred thirty-seven million, six hundred twelve thousand, four hundred sixty-five".