861177020 has 24 divisors (see below), whose sum is σ = 1972878768. Its totient is φ = 313155200.

The previous prime is 861176983. The next prime is 861177089. The reversal of 861177020 is 20771168.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1957001 + ... + 1957440.

It is an arithmetic number, because the mean of its divisors is an integer number (82203282).

Almost surely, 2^861177020 is an apocalyptic number.

It is an amenable number.

861177020 is an abundant number, since it is smaller than the sum of its proper divisors (1111701748).

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

861177020 is a wasteful number, since it uses less digits than its factorization.

861177020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3914461 (or 3914459 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 861177020 is about 29345.8177599466. The cubic root of 861177020 is about 951.4021842288.

The spelling of 861177020 in words is "eight hundred sixty-one million, one hundred seventy-seven thousand, twenty".