81400752 has 30 divisors (see below), whose sum is σ = 227809452. Its totient is φ = 27133536.

The previous prime is 81400729. The next prime is 81400799. The reversal of 81400752 is 25700418.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 282498 + ... + 282785.

Almost surely, 2^81400752 is an apocalyptic number.

It is an amenable number.

81400752 is an abundant number, since it is smaller than the sum of its proper divisors (146408700).

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

81400752 is a wasteful number, since it uses less digits than its factorization.

81400752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565297 (or 565288 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 81400752 is about 9022.2365298190. The cubic root of 81400752 is about 433.3872585094.

The spelling of 81400752 in words is "eighty-one million, four hundred thousand, seven hundred fifty-two".