81960358 has 4 divisors (see below), whose sum is σ = 122940540. Its totient is φ = 40980178.

The previous prime is 81960337. The next prime is 81960371. The reversal of 81960358 is 85306918.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 81960358.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20490088 + ... + 20490091.

It is an arithmetic number, because the mean of its divisors is an integer number (30735135).

Almost surely, 2^81960358 is an apocalyptic number.

81960358 is a deficient number, since it is larger than the sum of its proper divisors (40980182).

81960358 is a wasteful number, since it uses less digits than its factorization.

81960358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40980181.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 81960358 is about 9053.1960102496. The cubic root of 81960358 is about 434.3781275623.

The spelling of 81960358 in words is "eighty-one million, nine hundred sixty thousand, three hundred fifty-eight".