65696880 has 80 divisors (see below), whose sum is σ = 204522624. Its totient is φ = 17445120.

The previous prime is 65696879. The next prime is 65696887. The reversal of 65696880 is 8869656.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65696887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79027 + ... + 79853.

Almost surely, 2^65696880 is an apocalyptic number.

65696880 is a gapful number since it is divisible by the number (60) 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 65696880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102261312).

65696880 is an abundant number, since it is smaller than the sum of its proper divisors (138825744).

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

65696880 is a wasteful number, since it uses less digits than its factorization.

65696880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174 (or 1168 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 48.

The square root of 65696880 is about 8105.3611887442. The cubic root of 65696880 is about 403.5043753911.

65696880 divided by its sum of digits (48) gives a triangular number (1368685 = T₁₆₅₄).

The spelling of 65696880 in words is "sixty-five million, six hundred ninety-six thousand, eight hundred eighty".