64870431 has 4 divisors (see below), whose sum is σ = 86493912. Its totient is φ = 43246952.

The previous prime is 64870423. The next prime is 64870439. The reversal of 64870431 is 13407846.

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

It is an interprime number because it is at equal distance from previous prime (64870423) and next prime (64870439).

It is a cyclic number.

It is not a de Polignac number, because 64870431 - 2³ = 64870423 is a prime.

It is a super-2 number, since 2×64870431² = 8416345636251522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64870392 and 64870401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64870439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10811736 + ... + 10811741.

It is an arithmetic number, because the mean of its divisors is an integer number (21623478).

Almost surely, 2^64870431 is an apocalyptic number.

64870431 is a deficient number, since it is larger than the sum of its proper divisors (21623481).

64870431 is a wasteful number, since it uses less digits than its factorization.

64870431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21623480.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 64870431 is about 8054.2182115957. The cubic root of 64870431 is about 401.8052384457.

The spelling of 64870431 in words is "sixty-four million, eight hundred seventy thousand, four hundred thirty-one".