64981926 has 40 divisors (see below), whose sum is σ = 147276360. Its totient is φ = 21412512.

The previous prime is 64981907. The next prime is 64981933. The reversal of 64981926 is 62918946.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 12165 + ... + 16671.

It is an arithmetic number, because the mean of its divisors is an integer number (3681909).

Almost surely, 2^64981926 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64981926, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73638180).

64981926 is an abundant number, since it is smaller than the sum of its proper divisors (82294434).

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

64981926 is a wasteful number, since it uses less digits than its factorization.

64981926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4610 (or 4601 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 64981926 is about 8061.1367684713. The cubic root of 64981926 is about 402.0353054312.

The spelling of 64981926 in words is "sixty-four million, nine hundred eighty-one thousand, nine hundred twenty-six".