638791070 has 32 divisors (see below), whose sum is σ = 1188958176. Its totient is φ = 246937600.

The previous prime is 638791067. The next prime is 638791073. The reversal of 638791070 is 70197836.

638791070 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (638791067) and next prime (638791073).

It is a super-2 number, since 2×638791070² = 816108062223489800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638791073) 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, 36590 + ... + 51150.

It is an arithmetic number, because the mean of its divisors is an integer number (37154943).

Almost surely, 2^638791070 is an apocalyptic number.

638791070 is a deficient number, since it is larger than the sum of its proper divisors (550167106).

638791070 is a wasteful number, since it uses less digits than its factorization.

638791070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14716.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 638791070 is about 25274.3164101425. The cubic root of 638791070 is about 861.2309171758.

The spelling of 638791070 in words is "six hundred thirty-eight million, seven hundred ninety-one thousand, seventy".