64372736 has 30 divisors (see below), whose sum is σ = 128774310. Its totient is φ = 32178176.

The previous prime is 64372723. The next prime is 64372739. The reversal of 64372736 is 63727346.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 44302336 + 20070400 = 6656^2 + 4480^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64372736.

It is not an unprimeable number, because it can be changed into a prime (64372739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14420 + ... + 18348.

It is an arithmetic number, because the mean of its divisors is an integer number (4292477).

Almost surely, 2^64372736 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 64372736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64387155).

64372736 is an abundant number, since it is smaller than the sum of its proper divisors (64401574).

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

64372736 is an frugal number, since it uses more digits than its factorization.

64372736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3957 (or 3931 counting only the distinct ones).

The product of its digits is 127008, while the sum is 38.

The square root of 64372736 is about 8023.2621794380. The cubic root of 64372736 is about 400.7750306821.

The spelling of 64372736 in words is "sixty-four million, three hundred seventy-two thousand, seven hundred thirty-six".