64729815 has 16 divisors (see below), whose sum is σ = 103902048. Its totient is φ = 34411136.

The previous prime is 64729811. The next prime is 64729849. The reversal of 64729815 is 51892746.

It is a cyclic number.

It is not a de Polignac number, because 64729815 - 2² = 64729811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64729811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2052 + ... + 11561.

It is an arithmetic number, because the mean of its divisors is an integer number (6493878).

Almost surely, 2^64729815 is an apocalyptic number.

64729815 is a deficient number, since it is larger than the sum of its proper divisors (39172233).

64729815 is a wasteful number, since it uses less digits than its factorization.

64729815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13938.

The product of its digits is 120960, while the sum is 42.

The square root of 64729815 is about 8045.4841370796. The cubic root of 64729815 is about 401.5147048496.

The spelling of 64729815 in words is "sixty-four million, seven hundred twenty-nine thousand, eight hundred fifteen".