64866915 has 24 divisors (see below), whose sum is σ = 113078160. Its totient is φ = 34398144.

The previous prime is 64866913. The next prime is 64866937. The reversal of 64866915 is 51966846.

It is a Cunningham number, because it is equal to 8054²-1.

It is not a de Polignac number, because 64866915 - 2¹ = 64866913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (64866913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4029 + ... + 12081.

It is an arithmetic number, because the mean of its divisors is an integer number (4711590).

Almost surely, 2^64866915 is an apocalyptic number.

64866915 is a deficient number, since it is larger than the sum of its proper divisors (48211245).

64866915 is a wasteful number, since it uses less digits than its factorization.

64866915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8243 (or 8240 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 64866915 is about 8053.9999379190. Note that the first 4 decimals coincide. The cubic root of 64866915 is about 401.7979789865.

The spelling of 64866915 in words is "sixty-four million, eight hundred sixty-six thousand, nine hundred fifteen".