81381627900 has 54 divisors (see below), whose sum is σ = 255086194272. Its totient is φ = 21701767200.

The previous prime is 81381627869. The next prime is 81381627907. The reversal of 81381627900 is 972618318.

81381627900 is a `hidden beast` number, since 8 + 13 + 8 + 1 + 627 + 9 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81381627907) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 45211116 + ... + 45212915.

Almost surely, 2^81381627900 is an apocalyptic number.

It is an amenable number.

81381627900 is an abundant number, since it is smaller than the sum of its proper divisors (173704566372).

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

81381627900 is a wasteful number, since it uses less digits than its factorization.

81381627900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90424051 (or 90424041 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 81381627900 in words is "eighty-one billion, three hundred eighty-one million, six hundred twenty-seven thousand, nine hundred".