64249415 has 4 divisors (see below), whose sum is σ = 77099304. Its totient is φ = 51399528.

The previous prime is 64249411. The next prime is 64249421. The reversal of 64249415 is 51494246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51494246 = 2 ⋅25747123.

It is a cyclic number.

It is not a de Polignac number, because 64249415 - 2² = 64249411 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 (64249411) 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, 6424937 + ... + 6424946.

It is an arithmetic number, because the mean of its divisors is an integer number (19274826).

Almost surely, 2^64249415 is an apocalyptic number.

64249415 is a deficient number, since it is larger than the sum of its proper divisors (12849889).

64249415 is a wasteful number, since it uses less digits than its factorization.

64249415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12849888.

The product of its digits is 34560, while the sum is 35.

The square root of 64249415 is about 8015.5732795602. The cubic root of 64249415 is about 400.5189410427.

The spelling of 64249415 in words is "sixty-four million, two hundred forty-nine thousand, four hundred fifteen".