64981793 has 4 divisors (see below), whose sum is σ = 65412288. Its totient is φ = 64551300.

The previous prime is 64981789. The next prime is 64981799. The reversal of 64981793 is 39718946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64981793 - 2² = 64981789 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64981799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215021 + ... + 215322.

It is an arithmetic number, because the mean of its divisors is an integer number (16353072).

Almost surely, 2^64981793 is an apocalyptic number.

It is an amenable number.

64981793 is a deficient number, since it is larger than the sum of its proper divisors (430495).

64981793 is a wasteful number, since it uses less digits than its factorization.

64981793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430494.

The product of its digits is 326592, while the sum is 47.

The square root of 64981793 is about 8061.1285190102. The cubic root of 64981793 is about 402.0350311460.

The spelling of 64981793 in words is "sixty-four million, nine hundred eighty-one thousand, seven hundred ninety-three".