64406015 has 4 divisors (see below), whose sum is σ = 77287224. Its totient is φ = 51524808.

The previous prime is 64406009. The next prime is 64406033. The reversal of 64406015 is 51060446.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64406015 - 2⁶ = 64405951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6440597 + ... + 6440606.

It is an arithmetic number, because the mean of its divisors is an integer number (19321806).

Almost surely, 2^64406015 is an apocalyptic number.

64406015 is a deficient number, since it is larger than the sum of its proper divisors (12881209).

64406015 is a wasteful number, since it uses less digits than its factorization.

64406015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12881208.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 64406015 is about 8025.3358185187. The cubic root of 64406015 is about 400.8440821438.

The spelling of 64406015 in words is "sixty-four million, four hundred six thousand, fifteen".