66915632 has 40 divisors (see below), whose sum is σ = 148874400. Its totient is φ = 28541952.

The previous prime is 66915623. The next prime is 66915637. The reversal of 66915632 is 23651966.

It is not an unprimeable number, because it can be changed into a prime (66915637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24344 + ... + 26952.

It is an arithmetic number, because the mean of its divisors is an integer number (3721860).

Almost surely, 2^66915632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66915632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74437200).

66915632 is an abundant number, since it is smaller than the sum of its proper divisors (81958768).

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

66915632 is a wasteful number, since it uses less digits than its factorization.

66915632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2853 (or 2847 counting only the distinct ones).

The product of its digits is 58320, while the sum is 38.

The square root of 66915632 is about 8180.1975526267. The cubic root of 66915632 is about 405.9842584917.

The spelling of 66915632 in words is "sixty-six million, nine hundred fifteen thousand, six hundred thirty-two".