861579954 has 48 divisors (see below), whose sum is σ = 1951515072. Its totient is φ = 274199904.

The previous prime is 861579919. The next prime is 861579967. The reversal of 861579954 is 459975168.

861579954 is a `hidden beast` number, since 8 + 61 + 579 + 9 + 5 + 4 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 861579954.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 268749 + ... + 271935.

It is an arithmetic number, because the mean of its divisors is an integer number (40656564).

Almost surely, 2^861579954 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861579954, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (975757536).

861579954 is an abundant number, since it is smaller than the sum of its proper divisors (1089935118).

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

861579954 is a wasteful number, since it uses less digits than its factorization.

861579954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3871 (or 3868 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 54.

The square root of 861579954 is about 29352.6822283757. The cubic root of 861579954 is about 951.5505441694.

The spelling of 861579954 in words is "eight hundred sixty-one million, five hundred seventy-nine thousand, nine hundred fifty-four".