65021280 has 48 divisors (see below), whose sum is σ = 204818544. Its totient is φ = 17338880.

The previous prime is 65021279. The next prime is 65021293. The reversal of 65021280 is 8212056.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 65021280.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67251 + ... + 68210.

It is an arithmetic number, because the mean of its divisors is an integer number (4267053).

Almost surely, 2^65021280 is an apocalyptic number.

65021280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65021280 is an abundant number, since it is smaller than the sum of its proper divisors (139797264).

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

65021280 is a wasteful number, since it uses less digits than its factorization.

65021280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135479 (or 135471 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 65021280 is about 8063.5773698775. The cubic root of 65021280 is about 402.1164485300.

The spelling of 65021280 in words is "sixty-five million, twenty-one thousand, two hundred eighty".