81650458 has 4 divisors (see below), whose sum is σ = 122475690. Its totient is φ = 40825228.

The previous prime is 81650447. The next prime is 81650461. The reversal of 81650458 is 85405618.

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

It can be written as a sum of positive squares in only one way, i.e., 54952569 + 26697889 = 7413^2 + 5167^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20412613 + ... + 20412616.

Almost surely, 2^81650458 is an apocalyptic number.

81650458 is a deficient number, since it is larger than the sum of its proper divisors (40825232).

81650458 is a wasteful number, since it uses less digits than its factorization.

81650458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40825231.

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 81650458 is about 9036.0642981333. The cubic root of 81650458 is about 433.8299609247.

The spelling of 81650458 in words is "eighty-one million, six hundred fifty thousand, four hundred fifty-eight".