64678628 has 18 divisors (see below), whose sum is σ = 131667606. Its totient is φ = 27719328.

The previous prime is 64678619. The next prime is 64678637. The reversal of 64678628 is 82687646.

It is an interprime number because it is at equal distance from previous prime (64678619) and next prime (64678637).

It can be written as a sum of positive squares in only one way, i.e., 64128064 + 550564 = 8008^2 + 742^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 164801 + ... + 165192.

It is an arithmetic number, because the mean of its divisors is an integer number (7314867).

Almost surely, 2^64678628 is an apocalyptic number.

It is an amenable number.

64678628 is an abundant number, since it is smaller than the sum of its proper divisors (66988978).

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

64678628 is a wasteful number, since it uses less digits than its factorization.

64678628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330011 (or 330002 counting only the distinct ones).

The product of its digits is 774144, while the sum is 47.

The square root of 64678628 is about 8042.3024066495. The cubic root of 64678628 is about 401.4088404293.

The spelling of 64678628 in words is "sixty-four million, six hundred seventy-eight thousand, six hundred twenty-eight".