65770380 has 168 divisors, whose sum is σ = 223654032. Its totient is φ = 16142976.

The previous prime is 65770357. The next prime is 65770387. The reversal of 65770380 is 8307756.

65770380 is a `hidden beast` number, since 6 + 577 + 0 + 3 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (65770387) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 189367 + ... + 189713.

It is an arithmetic number, because the mean of its divisors is an integer number (1331274).

Almost surely, 2^65770380 is an apocalyptic number.

65770380 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 65770380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111827016).

65770380 is an abundant number, since it is smaller than the sum of its proper divisors (157883652).

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

65770380 is a wasteful number, since it uses less digits than its factorization.

65770380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 65770380 is about 8109.8939573832. The cubic root of 65770380 is about 403.6547961235.

The spelling of 65770380 in words is "sixty-five million, seven hundred seventy thousand, three hundred eighty".