64402415 has 48 divisors (see below), whose sum is σ = 102435840. Its totient is φ = 38364480.

The previous prime is 64402411. The next prime is 64402421. The reversal of 64402415 is 51420446.

It is not a de Polignac number, because 64402415 - 2² = 64402411 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64402411) 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 47 ways as a sum of consecutive naturals, for example, 61466 + ... + 62504.

It is an arithmetic number, because the mean of its divisors is an integer number (2134080).

Almost surely, 2^64402415 is an apocalyptic number.

64402415 is a deficient number, since it is larger than the sum of its proper divisors (38033425).

64402415 is a wasteful number, since it uses less digits than its factorization.

64402415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092 (or 1085 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 64402415 is about 8025.1115257048. Note that the first 3 decimals coincide. The cubic root of 64402415 is about 400.8366135578.

The spelling of 64402415 in words is "sixty-four million, four hundred two thousand, four hundred fifteen".