645622454 has 8 divisors (see below), whose sum is σ = 982073808. Its totient is φ = 318264520.

The previous prime is 645622433. The next prime is 645622477. The reversal of 645622454 is 454226546.

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

It is a congruent 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, 2273177 + ... + 2273460.

It is an arithmetic number, because the mean of its divisors is an integer number (122759226).

Almost surely, 2^645622454 is an apocalyptic number.

645622454 is a deficient number, since it is larger than the sum of its proper divisors (336451354).

645622454 is a wasteful number, since it uses less digits than its factorization.

645622454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4546710.

The product of its digits is 230400, while the sum is 38.

The square root of 645622454 is about 25409.1017944358. The cubic root of 645622454 is about 864.2901073045.

The spelling of 645622454 in words is "six hundred forty-five million, six hundred twenty-two thousand, four hundred fifty-four".