81473490 has 96 divisors (see below), whose sum is σ = 245306880. Its totient is φ = 18375552.

The previous prime is 81473479. The next prime is 81473551. The reversal of 81473490 is 9437418.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48952 + ... + 50588.

It is an arithmetic number, because the mean of its divisors is an integer number (2555280).

Almost surely, 2^81473490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81473490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122653440).

81473490 is an abundant number, since it is smaller than the sum of its proper divisors (163833390).

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

81473490 is a wasteful number, since it uses less digits than its factorization.

81473490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736 (or 1733 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 81473490 is about 9026.2666701134. The cubic root of 81473490 is about 433.5163086580.

The spelling of 81473490 in words is "eighty-one million, four hundred seventy-three thousand, four hundred ninety".