64398491 has 4 divisors (see below), whose sum is σ = 65305584. Its totient is φ = 63491400.

The previous prime is 64398487. The next prime is 64398511. The reversal of 64398491 is 19489346.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64398491 - 2² = 64398487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64398991) 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, 453440 + ... + 453581.

It is an arithmetic number, because the mean of its divisors is an integer number (16326396).

Almost surely, 2^64398491 is an apocalyptic number.

64398491 is a deficient number, since it is larger than the sum of its proper divisors (907093).

64398491 is an equidigital number, since it uses as much as digits as its factorization.

64398491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907092.

The product of its digits is 186624, while the sum is 44.

The square root of 64398491 is about 8024.8670393970. The cubic root of 64398491 is about 400.8284724820.

The spelling of 64398491 in words is "sixty-four million, three hundred ninety-eight thousand, four hundred ninety-one".