64990797 has 4 divisors (see below), whose sum is σ = 86654400. Its totient is φ = 43327196.

The previous prime is 64990763. The next prime is 64990817. The reversal of 64990797 is 79709946.

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 64990797 - 2⁶ = 64990733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64990747) 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, 10831797 + ... + 10831802.

It is an arithmetic number, because the mean of its divisors is an integer number (21663600).

Almost surely, 2^64990797 is an apocalyptic number.

It is an amenable number.

64990797 is a deficient number, since it is larger than the sum of its proper divisors (21663603).

64990797 is a wasteful number, since it uses less digits than its factorization.

64990797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21663602.

The product of its (nonzero) digits is 857304, while the sum is 51.

The square root of 64990797 is about 8061.6869822637. The cubic root of 64990797 is about 402.0535991996.

The spelling of 64990797 in words is "sixty-four million, nine hundred ninety thousand, seven hundred ninety-seven".