64641831 has 8 divisors (see below), whose sum is σ = 86254464. Its totient is φ = 43061880.

The previous prime is 64641817. The next prime is 64641833. The reversal of 64641831 is 13814646.

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

It is not a de Polignac number, because 64641831 - 2¹⁴ = 64625447 is a prime.

It is a super-2 number, since 2×64641831² = 8357132630065122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64641792 and 64641801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64641833) 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, 3105 + ... + 11786.

It is an arithmetic number, because the mean of its divisors is an integer number (10781808).

Almost surely, 2^64641831 is an apocalyptic number.

64641831 is a deficient number, since it is larger than the sum of its proper divisors (21612633).

64641831 is a wasteful number, since it uses less digits than its factorization.

64641831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16341.

The product of its digits is 13824, while the sum is 33.

The square root of 64641831 is about 8040.0143656588. The cubic root of 64641831 is about 401.3327027439.

The spelling of 64641831 in words is "sixty-four million, six hundred forty-one thousand, eight hundred thirty-one".