81474630 has 64 divisors (see below), whose sum is σ = 205286400. Its totient is φ = 20666240.

The previous prime is 81474623. The next prime is 81474647. The reversal of 81474630 is 3647418.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81474591 and 81474600.

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 31 ways as a sum of consecutive naturals, for example, 61111 + ... + 62429.

It is an arithmetic number, because the mean of its divisors is an integer number (3207600).

Almost surely, 2^81474630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81474630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102643200).

81474630 is an abundant number, since it is smaller than the sum of its proper divisors (123811770).

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

81474630 is a wasteful number, since it uses less digits than its factorization.

81474630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 81474630 is about 9026.3298189242. The cubic root of 81474630 is about 433.5183306093.

The spelling of 81474630 in words is "eighty-one million, four hundred seventy-four thousand, six hundred thirty".