64810491 has 8 divisors (see below), whose sum is σ = 89201664. Its totient is φ = 41813160.

The previous prime is 64810483. The next prime is 64810523. The reversal of 64810491 is 19401846.

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

It is not a de Polignac number, because 64810491 - 2³ = 64810483 is a prime.

It is a super-2 number, since 2×64810491² = 8400799487322162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64810441) 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, 348351 + ... + 348536.

It is an arithmetic number, because the mean of its divisors is an integer number (11150208).

Almost surely, 2^64810491 is an apocalyptic number.

64810491 is a deficient number, since it is larger than the sum of its proper divisors (24391173).

64810491 is a wasteful number, since it uses less digits than its factorization.

64810491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696921.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 64810491 is about 8050.4963201035. The cubic root of 64810491 is about 401.6814448706.

The spelling of 64810491 in words is "sixty-four million, eight hundred ten thousand, four hundred ninety-one".