64120831 has 8 divisors (see below), whose sum is σ = 66723264. Its totient is φ = 61570080.

The previous prime is 64120817. The next prime is 64120871. The reversal of 64120831 is 13802146.

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

It is a cyclic number.

It is not a de Polignac number, because 64120831 - 2⁵ = 64120799 is a prime.

It is a super-2 number, since 2×64120831² = 8222961936261122, 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 = 64120796 and 64120805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64120871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10380 + ... + 15361.

It is an arithmetic number, because the mean of its divisors is an integer number (8340408).

Almost surely, 2^64120831 is an apocalyptic number.

64120831 is a deficient number, since it is larger than the sum of its proper divisors (2602433).

64120831 is a wasteful number, since it uses less digits than its factorization.

64120831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25841.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 64120831 is about 8007.5483763759. The cubic root of 64120831 is about 400.2515729944.

Adding to 64120831 its reverse (13802146), we get a palindrome (77922977).

The spelling of 64120831 in words is "sixty-four million, one hundred twenty thousand, eight hundred thirty-one".