64247655 has 24 divisors (see below), whose sum is σ = 106243056. Its totient is φ = 33152640.

The previous prime is 64247647. The next prime is 64247663. The reversal of 64247655 is 55674246.

It is an interprime number because it is at equal distance from previous prime (64247647) and next prime (64247663).

It is not a de Polignac number, because 64247655 - 2³ = 64247647 is a prime.

It is a super-2 number, since 2×64247655² = 8255522345998050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12187 + ... + 16643.

It is an arithmetic number, because the mean of its divisors is an integer number (4426794).

Almost surely, 2^64247655 is an apocalyptic number.

64247655 is a deficient number, since it is larger than the sum of its proper divisors (41995401).

64247655 is a wasteful number, since it uses less digits than its factorization.

64247655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4527 (or 4496 counting only the distinct ones).

The product of its digits is 201600, while the sum is 39.

The square root of 64247655 is about 8015.4634925249. The cubic root of 64247655 is about 400.5152838380.

The spelling of 64247655 in words is "sixty-four million, two hundred forty-seven thousand, six hundred fifty-five".