61109920 has 24 divisors (see below), whose sum is σ = 144372564. Its totient is φ = 24443904.

The previous prime is 61109911. The next prime is 61109921. The reversal of 61109920 is 2990116.

It can be written as a sum of positive squares in 2 ways, for example, as 60652944 + 456976 = 7788^2 + 676^2 .

It is not an unprimeable number, because it can be changed into a prime (61109921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190809 + ... + 191128.

Almost surely, 2^61109920 is an apocalyptic number.

It is an amenable number.

61109920 is an abundant number, since it is smaller than the sum of its proper divisors (83262644).

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

61109920 is a wasteful number, since it uses less digits than its factorization.

61109920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381952 (or 381944 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 61109920 is about 7817.2834156118. The cubic root of 61109920 is about 393.8860243903.

The spelling of 61109920 in words is "sixty-one million, one hundred nine thousand, nine hundred twenty".