81484436 has 12 divisors (see below), whose sum is σ = 155561280. Its totient is φ = 37038360.

The previous prime is 81484427. The next prime is 81484453. The reversal of 81484436 is 63448418.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81484436.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 925916 + ... + 926003.

It is an arithmetic number, because the mean of its divisors is an integer number (12963440).

Almost surely, 2^81484436 is an apocalyptic number.

It is an amenable number.

81484436 is a deficient number, since it is larger than the sum of its proper divisors (74076844).

81484436 is a wasteful number, since it uses less digits than its factorization.

81484436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851934 (or 1851932 counting only the distinct ones).

The product of its digits is 73728, while the sum is 38.

The square root of 81484436 is about 9026.8729912412. The cubic root of 81484436 is about 433.5357221589.

The spelling of 81484436 in words is "eighty-one million, four hundred eighty-four thousand, four hundred thirty-six".