28261464642 has 24 divisors (see below), whose sum is σ = 61970925744. Its totient is φ = 9306987864.

The previous prime is 28261464629. The next prime is 28261464691. The reversal of 28261464642 is 24646416282.

28261464642 is a `hidden beast` number, since 28 + 2 + 614 + 6 + 4 + 6 + 4 + 2 = 666.

It is a super-2 number, since 2×28261464642² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9456828 + ... + 9459815.

It is an arithmetic number, because the mean of its divisors is an integer number (2582121906).

Almost surely, 2^28261464642 is an apocalyptic number.

28261464642 is an abundant number, since it is smaller than the sum of its proper divisors (33709461102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28261464642 is a wasteful number, since it uses less digits than its factorization.

28261464642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18916734 (or 18916731 counting only the distinct ones).

The product of its digits is 884736, while the sum is 45.

The spelling of 28261464642 in words is "twenty-eight billion, two hundred sixty-one million, four hundred sixty-four thousand, six hundred forty-two".