81597430 has 8 divisors (see below), whose sum is σ = 146875392. Its totient is φ = 32638968.

The previous prime is 81597427. The next prime is 81597449. The reversal of 81597430 is 3479518.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81597430.

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, 4079862 + ... + 4079881.

It is an arithmetic number, because the mean of its divisors is an integer number (18359424).

Almost surely, 2^81597430 is an apocalyptic number.

81597430 is a deficient number, since it is larger than the sum of its proper divisors (65277962).

81597430 is a wasteful number, since it uses less digits than its factorization.

81597430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8159750.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 81597430 is about 9033.1295794979. The cubic root of 81597430 is about 433.7360234349.

The spelling of 81597430 in words is "eighty-one million, five hundred ninety-seven thousand, four hundred thirty".