645131346 has 8 divisors (see below), whose sum is σ = 1290262704. Its totient is φ = 215043780.

The previous prime is 645131329. The next prime is 645131407. The reversal of 645131346 is 643131546.

It is a sphenic number, since it is the product of 3 distinct primes.

645131346 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53760940 + ... + 53760951.

It is an arithmetic number, because the mean of its divisors is an integer number (161282838).

Almost surely, 2^645131346 is an apocalyptic number.

645131346 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

645131346 is a wasteful number, since it uses less digits than its factorization.

645131346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107521896.

The product of its digits is 25920, while the sum is 33.

The square root of 645131346 is about 25399.4359386188. The cubic root of 645131346 is about 864.0709041391.

The spelling of 645131346 in words is "six hundred forty-five million, one hundred thirty-one thousand, three hundred forty-six".