81078922 has 8 divisors (see below), whose sum is σ = 122799456. Its totient is φ = 40145772.

The previous prime is 81078917. The next prime is 81078953. The reversal of 81078922 is 22987018.

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, 196588 + ... + 196999.

It is an arithmetic number, because the mean of its divisors is an integer number (15349932).

Almost surely, 2^81078922 is an apocalyptic number.

81078922 is a deficient number, since it is larger than the sum of its proper divisors (41720534).

81078922 is a wasteful number, since it uses less digits than its factorization.

81078922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393692.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 81078922 is about 9004.3834880574. The cubic root of 81078922 is about 432.8153504406.

The spelling of 81078922 in words is "eighty-one million, seventy-eight thousand, nine hundred twenty-two".