65619960 has 128 divisors (see below), whose sum is σ = 226713600. Its totient is φ = 14883840.

The previous prime is 65619959. The next prime is 65619971. The reversal of 65619960 is 6991656.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160236 + ... + 160644.

It is an arithmetic number, because the mean of its divisors is an integer number (1771200).

Almost surely, 2^65619960 is an apocalyptic number.

65619960 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 65619960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113356800).

65619960 is an abundant number, since it is smaller than the sum of its proper divisors (161093640).

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

65619960 is a wasteful number, since it uses less digits than its factorization.

65619960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621 (or 617 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 65619960 is about 8100.6147914834. The cubic root of 65619960 is about 403.3468352984.

The spelling of 65619960 in words is "sixty-five million, six hundred nineteen thousand, nine hundred sixty".