64061215 has 4 divisors (see below), whose sum is σ = 76873464. Its totient is φ = 51248968.

The previous prime is 64061201. The next prime is 64061237. The reversal of 64061215 is 51216046.

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 64061215 - 2⁵ = 64061183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64061215.

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, 6406117 + ... + 6406126.

It is an arithmetic number, because the mean of its divisors is an integer number (19218366).

Almost surely, 2^64061215 is an apocalyptic number.

64061215 is a deficient number, since it is larger than the sum of its proper divisors (12812249).

64061215 is a wasteful number, since it uses less digits than its factorization.

64061215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12812248.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 64061215 is about 8003.8250230749. The cubic root of 64061215 is about 400.1274906110.

The spelling of 64061215 in words is "sixty-four million, sixty-one thousand, two hundred fifteen".