81790146 has 12 divisors (see below), whose sum is σ = 177212022. Its totient is φ = 27263376.

The previous prime is 81790133. The next prime is 81790147. The reversal of 81790146 is 64109718.

It can be written as a sum of positive squares in only one way, i.e., 79655625 + 2134521 = 8925^2 + 1461^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81790146.

It is not an unprimeable number, because it can be changed into a prime (81790147) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2271931 + ... + 2271966.

Almost surely, 2^81790146 is an apocalyptic number.

81790146 is an abundant number, since it is smaller than the sum of its proper divisors (95421876).

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

81790146 is a wasteful number, since it uses less digits than its factorization.

81790146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4543905 (or 4543902 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 81790146 is about 9043.7904663918. The cubic root of 81790146 is about 434.0772194425.

The spelling of 81790146 in words is "eighty-one million, seven hundred ninety thousand, one hundred forty-six".