61913578 has 16 divisors (see below), whose sum is σ = 93937320. Its totient is φ = 30603456.

The previous prime is 61913557. The next prime is 61913639. The reversal of 61913578 is 87531916.

It can be written as a sum of positive squares in 4 ways, for example, as 50509449 + 11404129 = 7107^2 + 3377^2 .

It is a super-2 number, since 2×61913578² = 7666582281524168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61913578.

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, 84100 + ... + 84832.

Almost surely, 2^61913578 is an apocalyptic number.

61913578 is a deficient number, since it is larger than the sum of its proper divisors (32023742).

61913578 is a wasteful number, since it uses less digits than its factorization.

61913578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161.

The product of its digits is 45360, while the sum is 40.

The square root of 61913578 is about 7868.5181578236. The cubic root of 61913578 is about 395.6051781941.

The spelling of 61913578 in words is "sixty-one million, nine hundred thirteen thousand, five hundred seventy-eight".