638040577 has 16 divisors (see below), whose sum is σ = 689817600. Its totient is φ = 588304080.

The previous prime is 638040509. The next prime is 638040589. The reversal of 638040577 is 775040836.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638040577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638040077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103578 + ... + 109564.

It is an arithmetic number, because the mean of its divisors is an integer number (43113600).

Almost surely, 2^638040577 is an apocalyptic number.

It is an amenable number.

638040577 is a deficient number, since it is larger than the sum of its proper divisors (51777023).

638040577 is a wasteful number, since it uses less digits than its factorization.

638040577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6156.

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 638040577 is about 25259.4650972660. The cubic root of 638040577 is about 860.8935084391.

The spelling of 638040577 in words is "six hundred thirty-eight million, forty thousand, five hundred seventy-seven".