81157358 has 8 divisors (see below), whose sum is σ = 121948752. Its totient is φ = 40507776.

The previous prime is 81157357. The next prime is 81157361. The reversal of 81157358 is 85375118.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81157357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34010 + ... + 36317.

It is an arithmetic number, because the mean of its divisors is an integer number (15243594).

Almost surely, 2^81157358 is an apocalyptic number.

81157358 is a deficient number, since it is larger than the sum of its proper divisors (40791394).

81157358 is a wasteful number, since it uses less digits than its factorization.

81157358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70906.

The product of its digits is 33600, while the sum is 38.

The square root of 81157358 is about 9008.7378694243. The cubic root of 81157358 is about 432.9548744280.

The spelling of 81157358 in words is "eighty-one million, one hundred fifty-seven thousand, three hundred fifty-eight".