645377386 has 8 divisors (see below), whose sum is σ = 980320320. Its totient is φ = 318603948.

The previous prime is 645377363. The next prime is 645377399. The reversal of 645377386 is 683773546.

It is a happy number.

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

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, 2042176 + ... + 2042491.

It is an arithmetic number, because the mean of its divisors is an integer number (122540040).

Almost surely, 2^645377386 is an apocalyptic number.

645377386 is a deficient number, since it is larger than the sum of its proper divisors (334942934).

645377386 is a wasteful number, since it uses less digits than its factorization.

645377386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4084748.

The product of its digits is 2540160, while the sum is 49.

The square root of 645377386 is about 25404.2788915568. The cubic root of 645377386 is about 864.1807365454.

The spelling of 645377386 in words is "six hundred forty-five million, three hundred seventy-seven thousand, three hundred eighty-six".