64620808 has 48 divisors (see below), whose sum is σ = 149252220. Its totient is φ = 26062848.

The previous prime is 64620781. The next prime is 64620811. The reversal of 64620808 is 80802646.

It can be written as a sum of positive squares in 2 ways, for example, as 64352484 + 268324 = 8022^2 + 518^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1816 + ... + 11512.

Almost surely, 2^64620808 is an apocalyptic number.

64620808 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64620808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74626110).

64620808 is an abundant number, since it is smaller than the sum of its proper divisors (84631412).

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

64620808 is a wasteful number, since it uses less digits than its factorization.

64620808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9734 (or 9723 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 64620808 is about 8038.7068611811. The cubic root of 64620808 is about 401.2891905057.

The spelling of 64620808 in words is "sixty-four million, six hundred twenty thousand, eight hundred eight".