64737972 has 144 divisors (see below), whose sum is σ = 190794240. Its totient is φ = 18330624.

The previous prime is 64737971. The next prime is 64737979. The reversal of 64737972 is 27973746.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64737971) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 628473 + ... + 628575.

It is an arithmetic number, because the mean of its divisors is an integer number (1324960).

Almost surely, 2^64737972 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 64737972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95397120).

64737972 is an abundant number, since it is smaller than the sum of its proper divisors (126056268).

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

64737972 is a wasteful number, since it uses less digits than its factorization.

64737972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 217 counting only the distinct ones).

The product of its digits is 444528, while the sum is 45.

The square root of 64737972 is about 8045.9910514492. The cubic root of 64737972 is about 401.5315699160.

The spelling of 64737972 in words is "sixty-four million, seven hundred thirty-seven thousand, nine hundred seventy-two".