61539884 has 18 divisors (see below), whose sum is σ = 125278020. Its totient is φ = 26374152.

The previous prime is 61539883. The next prime is 61539901. The reversal of 61539884 is 48893516.

It is not an unprimeable number, because it can be changed into a prime (61539883) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 156794 + ... + 157185.

It is an arithmetic number, because the mean of its divisors is an integer number (6959890).

Almost surely, 2^61539884 is an apocalyptic number.

It is an amenable number.

61539884 is an abundant number, since it is smaller than the sum of its proper divisors (63738136).

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

61539884 is a wasteful number, since it uses less digits than its factorization.

61539884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313997 (or 313988 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The square root of 61539884 is about 7844.7360694927. The cubic root of 61539884 is about 394.8076486958.

The spelling of 61539884 in words is "sixty-one million, five hundred thirty-nine thousand, eight hundred eighty-four".