661237884 has 48 divisors (see below), whose sum is σ = 1716019200. Its totient is φ = 220194288.

The previous prime is 661237883. The next prime is 661237901. The reversal of 661237884 is 488732166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661237883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135739 + ... + 140525.

It is an arithmetic number, because the mean of its divisors is an integer number (35750400).

Almost surely, 2^661237884 is an apocalyptic number.

It is an amenable number.

661237884 is an abundant number, since it is smaller than the sum of its proper divisors (1054781316).

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

661237884 is a wasteful number, since it uses less digits than its factorization.

661237884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6079 (or 6071 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 661237884 is about 25714.5461558239. The cubic root of 661237884 is about 871.2027597451.

The spelling of 661237884 in words is "six hundred sixty-one million, two hundred thirty-seven thousand, eight hundred eighty-four".