71642664 has 64 divisors (see below), whose sum is σ = 203270400. Its totient is φ = 23369472.

The previous prime is 71642663. The next prime is 71642699. The reversal of 71642664 is 46624617.

71642664 is a `hidden beast` number, since 7 + 1 + 642 + 6 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (71642663) 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, 6624 + ... + 13680.

It is an arithmetic number, because the mean of its divisors is an integer number (3176100).

Almost surely, 2^71642664 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 71642664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101635200).

71642664 is an abundant number, since it is smaller than the sum of its proper divisors (131627736).

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

71642664 is a wasteful number, since it uses less digits than its factorization.

71642664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7119 (or 7109 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 71642664 is about 8464.1989579641. The cubic root of 71642664 is about 415.3273924973.

The spelling of 71642664 in words is "seventy-one million, six hundred forty-two thousand, six hundred sixty-four".