61988136 has 48 divisors (see below), whose sum is σ = 180275040. Its totient is φ = 17710560.

The previous prime is 61988131. The next prime is 61988161. The reversal of 61988136 is 63188916.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (61988131) 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, 25180 + ... + 27531.

It is an arithmetic number, because the mean of its divisors is an integer number (3755730).

Almost surely, 2^61988136 is an apocalyptic number.

It is an amenable number.

61988136 is an abundant number, since it is smaller than the sum of its proper divisors (118286904).

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

61988136 is a wasteful number, since it uses less digits than its factorization.

61988136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52734 (or 52723 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 61988136 is about 7873.2544732150. The cubic root of 61988136 is about 395.7639139672.

The spelling of 61988136 in words is "sixty-one million, nine hundred eighty-eight thousand, one hundred thirty-six".