65299920 has 160 divisors (see below), whose sum is σ = 236556288. Its totient is φ = 14590464.

The previous prime is 65299901. The next prime is 65299937. The reversal of 65299920 is 2999256.

65299920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78547 + ... + 79373.

Almost surely, 2^65299920 is an apocalyptic number.

65299920 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 65299920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118278144).

65299920 is an abundant number, since it is smaller than the sum of its proper divisors (171256368).

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

65299920 is a wasteful number, since it uses less digits than its factorization.

65299920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897 (or 891 counting only the distinct ones).

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

The square root of 65299920 is about 8080.8365903537. The cubic root of 65299920 is about 402.6900353868.

The spelling of 65299920 in words is "sixty-five million, two hundred ninety-nine thousand, nine hundred twenty".