81490723 has 8 divisors (see below), whose sum is σ = 84566016. Its totient is φ = 78443400.

The previous prime is 81490697. The next prime is 81490729. The reversal of 81490723 is 32709418.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81490723 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (81490729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 961 + ... + 12802.

It is an arithmetic number, because the mean of its divisors is an integer number (10570752).

Almost surely, 2^81490723 is an apocalyptic number.

81490723 is a deficient number, since it is larger than the sum of its proper divisors (3075293).

81490723 is a wasteful number, since it uses less digits than its factorization.

81490723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13985.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 81490723 is about 9027.2212225025. The cubic root of 81490723 is about 433.5468718096.

The spelling of 81490723 in words is "eighty-one million, four hundred ninety thousand, seven hundred twenty-three".