645730176 has 256 divisors, whose sum is σ = 2237276160. Its totient is φ = 160137216.

The previous prime is 645730171. The next prime is 645730177. The reversal of 645730176 is 671037546.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645730171) 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, 593505 + ... + 594591.

It is an arithmetic number, because the mean of its divisors is an integer number (8739360).

Almost surely, 2^645730176 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 645730176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1118638080).

645730176 is an abundant number, since it is smaller than the sum of its proper divisors (1591545984).

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

645730176 is a wasteful number, since it uses less digits than its factorization.

645730176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141 (or 1129 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 39.

The square root of 645730176 is about 25411.2214582456. The cubic root of 645730176 is about 864.3381735186.

The spelling of 645730176 in words is "six hundred forty-five million, seven hundred thirty thousand, one hundred seventy-six".