64691933 has 4 divisors (see below), whose sum is σ = 64708608. Its totient is φ = 64675260.

The previous prime is 64691927. The next prime is 64691969. The reversal of 64691933 is 33919646.

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 64691933 - 2¹⁸ = 64429789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64691983) 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, 878 + ... + 11408.

It is an arithmetic number, because the mean of its divisors is an integer number (16177152).

Almost surely, 2^64691933 is an apocalyptic number.

It is an amenable number.

64691933 is a deficient number, since it is larger than the sum of its proper divisors (16675).

64691933 is a wasteful number, since it uses less digits than its factorization.

64691933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16674.

The product of its digits is 104976, while the sum is 41.

The square root of 64691933 is about 8043.1295526058. The cubic root of 64691933 is about 401.4363630624.

The spelling of 64691933 in words is "sixty-four million, six hundred ninety-one thousand, nine hundred thirty-three".