81758722 has 8 divisors (see below), whose sum is σ = 123829056. Its totient is φ = 40482372.

The previous prime is 81758711. The next prime is 81758731. The reversal of 81758722 is 22785718.

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

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, 198238 + ... + 198649.

It is an arithmetic number, because the mean of its divisors is an integer number (15478632).

Almost surely, 2^81758722 is an apocalyptic number.

81758722 is a deficient number, since it is larger than the sum of its proper divisors (42070334).

81758722 is a wasteful number, since it uses less digits than its factorization.

81758722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396992.

The product of its digits is 62720, while the sum is 40.

The square root of 81758722 is about 9042.0529748503. The cubic root of 81758722 is about 434.0216210993.

The spelling of 81758722 in words is "eighty-one million, seven hundred fifty-eight thousand, seven hundred twenty-two".