81593402 has 8 divisors (see below), whose sum is σ = 133516512. Its totient is φ = 37087900.

The previous prime is 81593389. The next prime is 81593411. The reversal of 81593402 is 20439518.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1854374 + ... + 1854417.

It is an arithmetic number, because the mean of its divisors is an integer number (16689564).

Almost surely, 2^81593402 is an apocalyptic number.

81593402 is a deficient number, since it is larger than the sum of its proper divisors (51923110).

81593402 is a wasteful number, since it uses less digits than its factorization.

81593402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3708804.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 81593402 is about 9032.9066196878. The cubic root of 81593402 is about 433.7288862924.

The spelling of 81593402 in words is "eighty-one million, five hundred ninety-three thousand, four hundred two".