64840715 has 4 divisors (see below), whose sum is σ = 77808864. Its totient is φ = 51872568.

The previous prime is 64840697. The next prime is 64840729. The reversal of 64840715 is 51704846.

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

It is a cyclic number.

It is not a de Polignac number, because 64840715 - 2⁶ = 64840651 is a prime.

It is a super-2 number, since 2×64840715² = 8408636643422450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6484067 + ... + 6484076.

It is an arithmetic number, because the mean of its divisors is an integer number (19452216).

Almost surely, 2^64840715 is an apocalyptic number.

64840715 is a deficient number, since it is larger than the sum of its proper divisors (12968149).

64840715 is a wasteful number, since it uses less digits than its factorization.

64840715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12968148.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 64840715 is about 8052.3732526504. The cubic root of 64840715 is about 401.7438757780.

The spelling of 64840715 in words is "sixty-four million, eight hundred forty thousand, seven hundred fifteen".