81007452 has 36 divisors (see below), whose sum is σ = 212355416. Its totient is φ = 27002160.

The previous prime is 81007439. The next prime is 81007463. The reversal of 81007452 is 25470018.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

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, 40699 + ... + 42642.

Almost surely, 2^81007452 is an apocalyptic number.

It is an amenable number.

81007452 is an abundant number, since it is smaller than the sum of its proper divisors (131347964).

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

81007452 is a wasteful number, since it uses less digits than its factorization.

81007452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83360 (or 83346 counting only the distinct ones).

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

The square root of 81007452 is about 9000.4139904784. The cubic root of 81007452 is about 432.6881393814.

The spelling of 81007452 in words is "eighty-one million, seven thousand, four hundred fifty-two".