28400661570 has 64 divisors (see below), whose sum is σ = 68479706880. Its totient is φ = 7538227200.

The previous prime is 28400661517. The next prime is 28400661581. The reversal of 28400661570 is 7516600482.

It is a super-2 number, since 2×28400661570² (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 31 ways as a sum of consecutive naturals, for example, 13141290 + ... + 13143450.

It is an arithmetic number, because the mean of its divisors is an integer number (1069995420).

Almost surely, 2^28400661570 is an apocalyptic number.

28400661570 is an abundant number, since it is smaller than the sum of its proper divisors (40079045310).

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

28400661570 is a wasteful number, since it uses less digits than its factorization.

28400661570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4011.

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 28400661570 in words is "twenty-eight billion, four hundred million, six hundred sixty-one thousand, five hundred seventy".