81474552 has 32 divisors (see below), whose sum is σ = 226318800. Its totient is φ = 27158112.

The previous prime is 81474539. The next prime is 81474553. The reversal of 81474552 is 25547418.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81474553) 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, 188383 + ... + 188814.

Almost surely, 2^81474552 is an apocalyptic number.

It is an amenable number.

81474552 is an abundant number, since it is smaller than the sum of its proper divisors (144844248).

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

81474552 is a wasteful number, since it uses less digits than its factorization.

81474552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377212 (or 377202 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 81474552 is about 9026.3254982302. The cubic root of 81474552 is about 433.5181922658.

The spelling of 81474552 in words is "eighty-one million, four hundred seventy-four thousand, five hundred fifty-two".