64641431 has 8 divisors (see below), whose sum is σ = 67653600. Its totient is φ = 61646112.

The previous prime is 64641419. The next prime is 64641443. The reversal of 64641431 is 13414646.

It is an interprime number because it is at equal distance from previous prime (64641419) and next prime (64641443).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64641431 is a prime.

It is a super-2 number, since 2×64641431² = 8357029203455522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64641394 and 64641403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64641481) 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, 4001 + ... + 12053.

It is an arithmetic number, because the mean of its divisors is an integer number (8456700).

Almost surely, 2^64641431 is an apocalyptic number.

64641431 is a deficient number, since it is larger than the sum of its proper divisors (3012169).

64641431 is a wasteful number, since it uses less digits than its factorization.

64641431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8425.

The product of its digits is 6912, while the sum is 29.

The square root of 64641431 is about 8039.9894900429. The cubic root of 64641431 is about 401.3318749341.

The spelling of 64641431 in words is "sixty-four million, six hundred forty-one thousand, four hundred thirty-one".