28197626940 has 144 divisors (see below), whose sum is σ = 102001955328. Its totient is φ = 6164940672.

The previous prime is 28197626879. The next prime is 28197626953. The reversal of 28197626940 is 4962679182.

28197626940 is a `hidden beast` number, since 2 + 8 + 1 + 9 + 7 + 626 + 9 + 4 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 457522 + ... + 515481.

It is an arithmetic number, because the mean of its divisors is an integer number (708346912).

Almost surely, 2^28197626940 is an apocalyptic number.

28197626940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28197626940 is an abundant number, since it is smaller than the sum of its proper divisors (73804328388).

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

28197626940 is a wasteful number, since it uses less digits than its factorization.

28197626940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973048 (or 973043 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 28197626940 in words is "twenty-eight billion, one hundred ninety-seven million, six hundred twenty-six thousand, nine hundred forty".