81037422 has 20 divisors (see below), whose sum is σ = 181584216. Its totient is φ = 27012420.

The previous prime is 81037421. The next prime is 81037427. The reversal of 81037422 is 22473018.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81037421) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 249954 + ... + 250277.

Almost surely, 2^81037422 is an apocalyptic number.

81037422 is an abundant number, since it is smaller than the sum of its proper divisors (100546794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81037422 is a wasteful number, since it uses less digits than its factorization.

81037422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500245 (or 500236 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 81037422 is about 9002.0787599310. The cubic root of 81037422 is about 432.7414927637.

The spelling of 81037422 in words is "eighty-one million, thirty-seven thousand, four hundred twenty-two".