27961778581902 has 48 divisors (see below), whose sum is σ = 66529168617600. Its totient is φ = 8417151882000.

The previous prime is 27961778581859. The next prime is 27961778581937. The reversal of 27961778581902 is 20918587716972.

27961778581902 is a `hidden beast` number, since 27 + 9 + 6 + 17 + 7 + 8 + 581 + 9 + 0 + 2 = 666.

It is a super-2 number, since 2×27961778581902² (a number of 28 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 23 ways as a sum of consecutive naturals, for example, 467589652 + ... + 467649447.

It is an arithmetic number, because the mean of its divisors is an integer number (1386024346200).

Almost surely, 2^{27961778581902} is an apocalyptic number.

27961778581902 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

27961778581902 is an abundant number, since it is smaller than the sum of its proper divisors (38567390035698).

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

27961778581902 is a wasteful number, since it uses less digits than its factorization.

27961778581902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935239269 (or 935239266 counting only the distinct ones).

The product of its (nonzero) digits is 213373440, while the sum is 72.

The spelling of 27961778581902 in words is "twenty-seven trillion, nine hundred sixty-one billion, seven hundred seventy-eight million, five hundred eighty-one thousand, nine hundred two".