64868731 has 4 divisors (see below), whose sum is σ = 64894392. Its totient is φ = 64843072.

The previous prime is 64868729. The next prime is 64868743. The reversal of 64868731 is 13786846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13786846 = 2 ⋅6893423.

It is a cyclic number.

It is not a de Polignac number, because 64868731 - 2¹ = 64868729 is a prime.

It is a super-2 number, since 2×64868731² = 8415904523100722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64868701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8566 + ... + 14251.

It is an arithmetic number, because the mean of its divisors is an integer number (16223598).

Almost surely, 2^64868731 is an apocalyptic number.

64868731 is a deficient number, since it is larger than the sum of its proper divisors (25661).

64868731 is a wasteful number, since it uses less digits than its factorization.

64868731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25660.

The product of its digits is 193536, while the sum is 43.

The square root of 64868731 is about 8054.1126761425. The cubic root of 64868731 is about 401.8017285010.

The spelling of 64868731 in words is "sixty-four million, eight hundred sixty-eight thousand, seven hundred thirty-one".