64461615 has 16 divisors (see below), whose sum is σ = 104105088. Its totient is φ = 34057376.

The previous prime is 64461611. The next prime is 64461629. The reversal of 64461615 is 51616446.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 64461615 - 2² = 64461611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64461611) 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, 18477 + ... + 21686.

It is an arithmetic number, because the mean of its divisors is an integer number (6506568).

Almost surely, 2^64461615 is an apocalyptic number.

64461615 is a deficient number, since it is larger than the sum of its proper divisors (39643473).

64461615 is a wasteful number, since it uses less digits than its factorization.

64461615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40278.

The product of its digits is 17280, while the sum is 33.

The square root of 64461615 is about 8028.7991007373. The cubic root of 64461615 is about 400.9593949801.

The spelling of 64461615 in words is "sixty-four million, four hundred sixty-one thousand, six hundred fifteen".