81048900 has 36 divisors (see below), whose sum is σ = 234502352. Its totient is φ = 21612960.

The previous prime is 81048899. The next prime is 81048959. The reversal of 81048900 is 984018.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134782 + ... + 135381.

Almost surely, 2^81048900 is an apocalyptic number.

It is an amenable number.

81048900 is an abundant number, since it is smaller than the sum of its proper divisors (153453452).

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

81048900 is a wasteful number, since it uses less digits than its factorization.

81048900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270180 (or 270173 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 81048900 is about 9002.7162567750. The cubic root of 81048900 is about 432.7619227175.

The spelling of 81048900 in words is "eighty-one million, forty-eight thousand, nine hundred".