645084838 has 4 divisors (see below), whose sum is σ = 967627260. Its totient is φ = 322542418.

The previous prime is 645084829. The next prime is 645084851. The reversal of 645084838 is 838480546.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×645084838² = 832268896434972488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161271208 + ... + 161271211.

It is an arithmetic number, because the mean of its divisors is an integer number (241906815).

Almost surely, 2^645084838 is an apocalyptic number.

645084838 is a deficient number, since it is larger than the sum of its proper divisors (322542422).

645084838 is a wasteful number, since it uses less digits than its factorization.

645084838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322542421.

The product of its (nonzero) digits is 737280, while the sum is 46.

The square root of 645084838 is about 25398.5203899755. The cubic root of 645084838 is about 864.0501398014.

The spelling of 645084838 in words is "six hundred forty-five million, eighty-four thousand, eight hundred thirty-eight".