65697520 has 160 divisors (see below), whose sum is σ = 189416448. Its totient is φ = 20680704.

The previous prime is 65697491. The next prime is 65697521. The reversal of 65697520 is 2579656.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65697521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 637789 + ... + 637891.

Almost surely, 2^65697520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65697520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94708224).

65697520 is an abundant number, since it is smaller than the sum of its proper divisors (123718928).

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

65697520 is a wasteful number, since it uses less digits than its factorization.

65697520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 65697520 is about 8105.4006686900. The cubic root of 65697520 is about 403.5056856612.

The spelling of 65697520 in words is "sixty-five million, six hundred ninety-seven thousand, five hundred twenty".