65770320 has 160 divisors (see below), whose sum is σ = 254269440. Its totient is φ = 13662720.

The previous prime is 65770301. The next prime is 65770321. The reversal of 65770320 is 2307756.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65770321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16701 + ... + 20259.

It is an arithmetic number, because the mean of its divisors is an integer number (1589184).

Almost surely, 2^65770320 is an apocalyptic number.

65770320 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 65770320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127134720).

65770320 is an abundant number, since it is smaller than the sum of its proper divisors (188499120).

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

65770320 is a wasteful number, since it uses less digits than its factorization.

65770320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593 (or 3587 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 30.

The square root of 65770320 is about 8109.8902581971. The cubic root of 65770320 is about 403.6546733768.

The spelling of 65770320 in words is "sixty-five million, seven hundred seventy thousand, three hundred twenty".