81474460 has 24 divisors (see below), whose sum is σ = 173161296. Its totient is φ = 32196480.

The previous prime is 81474391. The next prime is 81474461. The reversal of 81474460 is 6447418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81474461) 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, 22881 + ... + 26200.

It is an arithmetic number, because the mean of its divisors is an integer number (7215054).

Almost surely, 2^81474460 is an apocalyptic number.

It is an amenable number.

81474460 is an abundant number, since it is smaller than the sum of its proper divisors (91686836).

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

81474460 is a wasteful number, since it uses less digits than its factorization.

81474460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49173 (or 49171 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 81474460 is about 9026.3204020243. The cubic root of 81474460 is about 433.5180290914.

The spelling of 81474460 in words is "eighty-one million, four hundred seventy-four thousand, four hundred sixty".