638654026270 has 128 divisors (see below), whose sum is σ = 1315802880000. Its totient is φ = 221470986240.

The previous prime is 638654026259. The next prime is 638654026327. The reversal of 638654026270 is 72620456836.

638654026270 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×638654026270² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 53939011 + ... + 53950849.

It is an arithmetic number, because the mean of its divisors is an integer number (10279710000).

Almost surely, 2^638654026270 is an apocalyptic number.

638654026270 is an abundant number, since it is smaller than the sum of its proper divisors (677148853730).

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

638654026270 is a wasteful number, since it uses less digits than its factorization.

638654026270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12278.

The product of its (nonzero) digits is 2903040, while the sum is 49.

The spelling of 638654026270 in words is "six hundred thirty-eight billion, six hundred fifty-four million, twenty-six thousand, two hundred seventy".