64995858 has 20 divisors (see below), whose sum is σ = 145639230. Its totient is φ = 21665232.

The previous prime is 64995857. The next prime is 64995859. The reversal of 64995858 is 85859946.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64995857) and next prime (64995859).

It can be written as a sum of positive squares in only one way, i.e., 52229529 + 12766329 = 7227^2 + 3573^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (64995851) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 200443 + ... + 200766.

Almost surely, 2^64995858 is an apocalyptic number.

64995858 is an abundant number, since it is smaller than the sum of its proper divisors (80643372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64995858 is a wasteful number, since it uses less digits than its factorization.

64995858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401223 (or 401214 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The square root of 64995858 is about 8062.0008682709. Note that the first 3 decimals coincide. The cubic root of 64995858 is about 402.0640352436.

The spelling of 64995858 in words is "sixty-four million, nine hundred ninety-five thousand, eight hundred fifty-eight".