81470494 has 32 divisors (see below), whose sum is σ = 149446080. Its totient is φ = 32514048.

The previous prime is 81470479. The next prime is 81470507. The reversal of 81470494 is 49407418.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21322 + ... + 24850.

It is an arithmetic number, because the mean of its divisors is an integer number (4670190).

Almost surely, 2^81470494 is an apocalyptic number.

81470494 is a deficient number, since it is larger than the sum of its proper divisors (67975586).

81470494 is a wasteful number, since it uses less digits than its factorization.

81470494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3652.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 81470494 is about 9026.1007085009. The cubic root of 81470494 is about 433.5109947381.

The spelling of 81470494 in words is "eighty-one million, four hundred seventy thousand, four hundred ninety-four".