64820680 has 16 divisors (see below), whose sum is σ = 145846620. Its totient is φ = 25928256.

The previous prime is 64820671. The next prime is 64820729. The reversal of 64820680 is 8602846.

It can be written as a sum of positive squares in 2 ways, for example, as 63776196 + 1044484 = 7986^2 + 1022^2 .

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, 810219 + ... + 810298.

Almost surely, 2^64820680 is an apocalyptic number.

It is an amenable number.

64820680 is an abundant number, since it is smaller than the sum of its proper divisors (81025940).

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

64820680 is a wasteful number, since it uses less digits than its factorization.

64820680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620528 (or 1620524 counting only the distinct ones).

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

The square root of 64820680 is about 8051.1291133604. The cubic root of 64820680 is about 401.7024935091.

The spelling of 64820680 in words is "sixty-four million, eight hundred twenty thousand, six hundred eighty".