861972552 has 48 divisors (see below), whose sum is σ = 2668011840. Its totient is φ = 246277728.

The previous prime is 861972509. The next prime is 861972581. The reversal of 861972552 is 255279168.

861972552 is a `hidden beast` number, since 8 + 6 + 1 + 97 + 2 + 552 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 861972498 and 861972507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 854628 + ... + 855635.

It is an arithmetic number, because the mean of its divisors is an integer number (55583580).

Almost surely, 2^861972552 is an apocalyptic number.

It is an amenable number.

861972552 is an abundant number, since it is smaller than the sum of its proper divisors (1806039288).

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

861972552 is a wasteful number, since it uses less digits than its factorization.

861972552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710282 (or 1710275 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 861972552 is about 29359.3690667902. The cubic root of 861972552 is about 951.6950539197.

The spelling of 861972552 in words is "eight hundred sixty-one million, nine hundred seventy-two thousand, five hundred fifty-two".