64742015 has 16 divisors (see below), whose sum is σ = 83834688. Its totient is φ = 47713536.

The previous prime is 64741979. The next prime is 64742017. The reversal of 64742015 is 51024746.

It is a de Polignac number, because none of the positive numbers 2^k-64742015 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64742017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60374 + ... + 61436.

It is an arithmetic number, because the mean of its divisors is an integer number (5239668).

Almost surely, 2^64742015 is an apocalyptic number.

64742015 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

64742015 is a deficient number, since it is larger than the sum of its proper divisors (19092673).

64742015 is a wasteful number, since it uses less digits than its factorization.

64742015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2018.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 64742015 is about 8046.2422906597. The cubic root of 64742015 is about 401.5399285258.

The spelling of 64742015 in words is "sixty-four million, seven hundred forty-two thousand, fifteen".