81187352 has 16 divisors (see below), whose sum is σ = 154154400. Its totient is φ = 40079520.

The previous prime is 81187333. The next prime is 81187367. The reversal of 81187352 is 25378118.

It is a super-2 number, since 2×81187352² = 13182772249543808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63599 + ... + 64862.

It is an arithmetic number, because the mean of its divisors is an integer number (9634650).

Almost surely, 2^81187352 is an apocalyptic number.

It is an amenable number.

81187352 is a deficient number, since it is larger than the sum of its proper divisors (72967048).

81187352 is a wasteful number, since it uses less digits than its factorization.

81187352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128546 (or 128542 counting only the distinct ones).

The product of its digits is 13440, while the sum is 35.

The square root of 81187352 is about 9010.4024327441. The cubic root of 81187352 is about 433.0082047703.

The spelling of 81187352 in words is "eighty-one million, one hundred eighty-seven thousand, three hundred fifty-two".