638325495 has 64 divisors (see below), whose sum is σ = 1181614080. Its totient is φ = 326592000.

The previous prime is 638325491. The next prime is 638325521. The reversal of 638325495 is 594523836.

638325495 is a `hidden beast` number, since 63 + 83 + 25 + 495 = 666.

It is not a de Polignac number, because 638325495 - 2² = 638325491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 638325495.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638325491) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 530895 + ... + 532095.

It is an arithmetic number, because the mean of its divisors is an integer number (18462720).

Almost surely, 2^638325495 is an apocalyptic number.

638325495 is a deficient number, since it is larger than the sum of its proper divisors (543288585).

638325495 is a wasteful number, since it uses less digits than its factorization.

638325495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373 (or 1367 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 638325495 is about 25265.1042942633. The cubic root of 638325495 is about 861.0216338091.

It can be divided in two parts, 6383 and 25495, that added together give a triangular number (31878 = T₂₅₂).

The spelling of 638325495 in words is "six hundred thirty-eight million, three hundred twenty-five thousand, four hundred ninety-five".