81280152 has 32 divisors (see below), whose sum is σ = 225778800. Its totient is φ = 27093312.

The previous prime is 81280151. The next prime is 81280159. The reversal of 81280152 is 25108218.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81280151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187933 + ... + 188364.

Almost surely, 2^81280152 is an apocalyptic number.

It is an amenable number.

81280152 is an abundant number, since it is smaller than the sum of its proper divisors (144498648).

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

81280152 is a wasteful number, since it uses less digits than its factorization.

81280152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376312 (or 376302 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 81280152 is about 9015.5505655506. The cubic root of 81280152 is about 433.1731231551.

The spelling of 81280152 in words is "eighty-one million, two hundred eighty thousand, one hundred fifty-two".