65699680 has 24 divisors (see below), whose sum is σ = 155215872. Its totient is φ = 26279808.

The previous prime is 65699677. The next prime is 65699681. The reversal of 65699680 is 8699656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65699681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205152 + ... + 205471.

It is an arithmetic number, because the mean of its divisors is an integer number (6467328).

Almost surely, 2^65699680 is an apocalyptic number.

It is an amenable number.

65699680 is an abundant number, since it is smaller than the sum of its proper divisors (89516192).

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

65699680 is a wasteful number, since it uses less digits than its factorization.

65699680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410638 (or 410630 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 65699680 is about 8105.5339120875. The cubic root of 65699680 is about 403.5101077598.

The spelling of 65699680 in words is "sixty-five million, six hundred ninety-nine thousand, six hundred eighty".