65481880 has 32 divisors (see below), whose sum is σ = 149415840. Its totient is φ = 25822720.

The previous prime is 65481833. The next prime is 65481883. The reversal of 65481880 is 8818456.

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 (65481883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8689 + ... + 14368.

It is an arithmetic number, because the mean of its divisors is an integer number (4669245).

Almost surely, 2^65481880 is an apocalyptic number.

It is an amenable number.

65481880 is an abundant number, since it is smaller than the sum of its proper divisors (83933960).

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

65481880 is a wasteful number, since it uses less digits than its factorization.

65481880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23139 (or 23135 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 65481880 is about 8092.0874933481. The cubic root of 65481880 is about 403.0637240758.

The spelling of 65481880 in words is "sixty-five million, four hundred eighty-one thousand, eight hundred eighty".