638714780 has 24 divisors (see below), whose sum is σ = 1463238000. Its totient is φ = 232259840.

The previous prime is 638714777. The next prime is 638714827. The reversal of 638714780 is 87417836.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1451405 + ... + 1451844.

It is an arithmetic number, because the mean of its divisors is an integer number (60968250).

Almost surely, 2^638714780 is an apocalyptic number.

It is an amenable number.

638714780 is an abundant number, since it is smaller than the sum of its proper divisors (824523220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638714780 is a wasteful number, since it uses less digits than its factorization.

638714780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2903269 (or 2903267 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 638714780 is about 25272.8071254461. The cubic root of 638714780 is about 861.1966305754.

The spelling of 638714780 in words is "six hundred thirty-eight million, seven hundred fourteen thousand, seven hundred eighty".