64801997 has 16 divisors (see below), whose sum is σ = 72726528. Its totient is φ = 57335040.

The previous prime is 64801967. The next prime is 64801999. The reversal of 64801997 is 79910846.

It is a cyclic number.

It is not a de Polignac number, because 64801997 - 2¹⁰ = 64800973 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 (64801999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44828 + ... + 46250.

It is an arithmetic number, because the mean of its divisors is an integer number (4545408).

Almost surely, 2^64801997 is an apocalyptic number.

It is an amenable number.

64801997 is a deficient number, since it is larger than the sum of its proper divisors (7924531).

64801997 is a wasteful number, since it uses less digits than its factorization.

64801997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 64801997 is about 8049.9687577033. The cubic root of 64801997 is about 401.6638961106.

The spelling of 64801997 in words is "sixty-four million, eight hundred one thousand, nine hundred ninety-seven".