64992821 has 8 divisors (see below), whose sum is σ = 65530080. Its totient is φ = 64458288.

The previous prime is 64992791. The next prime is 64992841. The reversal of 64992821 is 12829946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64992821 - 2¹⁴ = 64976437 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 (64992841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82190 + ... + 82976.

It is an arithmetic number, because the mean of its divisors is an integer number (8191260).

Almost surely, 2^64992821 is an apocalyptic number.

It is an amenable number.

64992821 is a deficient number, since it is larger than the sum of its proper divisors (537259).

64992821 is a wasteful number, since it uses less digits than its factorization.

64992821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363.

The product of its digits is 62208, while the sum is 41.

The square root of 64992821 is about 8061.8125133248. The cubic root of 64992821 is about 402.0577728574.

The spelling of 64992821 in words is "sixty-four million, nine hundred ninety-two thousand, eight hundred twenty-one".