29180920638 has 16 divisors (see below), whose sum is σ = 58501134720. Its totient is φ = 9703757976.

The previous prime is 29180920621. The next prime is 29180920649. The reversal of 29180920638 is 83602908192.

It is a super-2 number, since 2×29180920638² (a number of 22 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 7 ways as a sum of consecutive naturals, for example, 5801170 + ... + 5806197.

It is an arithmetic number, because the mean of its divisors is an integer number (3656320920).

Almost surely, 2^29180920638 is an apocalyptic number.

29180920638 is an abundant number, since it is smaller than the sum of its proper divisors (29320214082).

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

29180920638 is a wasteful number, since it uses less digits than its factorization.

29180920638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11607791.

The product of its (nonzero) digits is 373248, while the sum is 48.

The spelling of 29180920638 in words is "twenty-nine billion, one hundred eighty million, nine hundred twenty thousand, six hundred thirty-eight".