961918578 has 40 divisors (see below), whose sum is σ = 2158050972. Its totient is φ = 320246784.

The previous prime is 961918549. The next prime is 961918597. The reversal of 961918578 is 875819169.

961918578 is a `hidden beast` number, since 9 + 61 + 9 + 1 + 8 + 578 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 846635409 + 115283169 = 29097^2 + 10737^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 148626 + ... + 154962.

Almost surely, 2^961918578 is an apocalyptic number.

961918578 is an abundant number, since it is smaller than the sum of its proper divisors (1196132394).

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

961918578 is a wasteful number, since it uses less digits than its factorization.

961918578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7288 (or 7279 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 54.

The square root of 961918578 is about 31014.8122354465. The cubic root of 961918578 is about 987.1415619054.

The spelling of 961918578 in words is "nine hundred sixty-one million, nine hundred eighteen thousand, five hundred seventy-eight".