81422377 has 8 divisors (see below), whose sum is σ = 84211200. Its totient is φ = 78677664.

The previous prime is 81422339. The next prime is 81422389. The reversal of 81422377 is 77322418.

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-81422377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81422777) 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, 7252 + ... + 14677.

It is an arithmetic number, because the mean of its divisors is an integer number (10526400).

Almost surely, 2^81422377 is an apocalyptic number.

It is an amenable number.

81422377 is a deficient number, since it is larger than the sum of its proper divisors (2788823).

81422377 is a wasteful number, since it uses less digits than its factorization.

81422377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22055.

The product of its digits is 18816, while the sum is 34.

The square root of 81422377 is about 9023.4348781381. The cubic root of 81422377 is about 433.4256331330.

The spelling of 81422377 in words is "eighty-one million, four hundred twenty-two thousand, three hundred seventy-seven".