81490046 has 16 divisors (see below), whose sum is σ = 135176688. Its totient is φ = 36532800.

The previous prime is 81490043. The next prime is 81490067. The reversal of 81490046 is 64009418.

It is a junction number, because it is equal to n+sod(n) for n = 81489994 and 81490021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81490043) 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, 23765 + ... + 26976.

It is an arithmetic number, because the mean of its divisors is an integer number (8448543).

Almost surely, 2^81490046 is an apocalyptic number.

81490046 is a deficient number, since it is larger than the sum of its proper divisors (53686642).

81490046 is a wasteful number, since it uses less digits than its factorization.

81490046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50827.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 81490046 is about 9027.1837247283. The cubic root of 81490046 is about 433.5456712146.

The spelling of 81490046 in words is "eighty-one million, four hundred ninety thousand, forty-six".