64839372 has 48 divisors (see below), whose sum is σ = 163736832. Its totient is φ = 19851840.

The previous prime is 64839371. The next prime is 64839373. The reversal of 64839372 is 27393846.

It is an interprime number because it is at equal distance from previous prime (64839371) and next prime (64839373).

It is a super-2 number, since 2×64839372² = 8408288322708768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64839371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34497 + ... + 36327.

It is an arithmetic number, because the mean of its divisors is an integer number (3411184).

Almost surely, 2^64839372 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 64839372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81868416).

64839372 is an abundant number, since it is smaller than the sum of its proper divisors (98897460).

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

64839372 is a wasteful number, since it uses less digits than its factorization.

64839372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2078 (or 2076 counting only the distinct ones).

The product of its digits is 217728, while the sum is 42.

The square root of 64839372 is about 8052.2898606545. The cubic root of 64839372 is about 401.7411020796.

The spelling of 64839372 in words is "sixty-four million, eight hundred thirty-nine thousand, three hundred seventy-two".