64819731 has 8 divisors (see below), whose sum is σ = 87048640. Its totient is φ = 42901992.

The previous prime is 64819661. The next prime is 64819739. The reversal of 64819731 is 13791846.

64819731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 64819731 - 2¹⁰ = 64818707 is a prime.

It is a super-2 number, since 2×64819731² = 8403195053824722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64819731.

It is not an unprimeable number, because it can be changed into a prime (64819739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77305 + ... + 78138.

It is an arithmetic number, because the mean of its divisors is an integer number (10881080).

Almost surely, 2^64819731 is an apocalyptic number.

64819731 is a deficient number, since it is larger than the sum of its proper divisors (22228909).

64819731 is a wasteful number, since it uses less digits than its factorization.

64819731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155585.

The product of its digits is 36288, while the sum is 39.

The square root of 64819731 is about 8051.0701773118. The cubic root of 64819731 is about 401.7005331392.

The spelling of 64819731 in words is "sixty-four million, eight hundred nineteen thousand, seven hundred thirty-one".