861178788 has 36 divisors (see below), whose sum is σ = 2271517248. Its totient is φ = 274578480.

The previous prime is 861178783. The next prime is 861178793. The reversal of 861178788 is 887871168.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (861178783) and next prime (861178793).

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×861178788² = 1483257809802297888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (861178783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 519208 + ... + 520863.

Almost surely, 2^861178788 is an apocalyptic number.

It is an amenable number.

861178788 is an abundant number, since it is smaller than the sum of its proper divisors (1410338460).

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

861178788 is a wasteful number, since it uses less digits than its factorization.

861178788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040104 (or 1040099 counting only the distinct ones).

The product of its digits is 1204224, while the sum is 54.

The square root of 861178788 is about 29345.8478834741. The cubic root of 861178788 is about 951.4028353059.

The spelling of 861178788 in words is "eight hundred sixty-one million, one hundred seventy-eight thousand, seven hundred eighty-eight".