65506720 has 96 divisors (see below), whose sum is σ = 163731456. Its totient is φ = 24729600.

The previous prime is 65506703. The next prime is 65506747. The reversal of 65506720 is 2760556.

It is a super-2 number, since 2×65506720² = 8582260730316800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232980 + ... + 233260.

It is an arithmetic number, because the mean of its divisors is an integer number (1705536).

Almost surely, 2^65506720 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 65506720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81865728).

65506720 is an abundant number, since it is smaller than the sum of its proper divisors (98224736).

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

65506720 is a wasteful number, since it uses less digits than its factorization.

65506720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 65506720 is about 8093.6221804579. The cubic root of 65506720 is about 403.1146839096.

The spelling of 65506720 in words is "sixty-five million, five hundred six thousand, seven hundred twenty".