81427250 has 16 divisors (see below), whose sum is σ = 152432280. Its totient is φ = 32570800.

The previous prime is 81427249. The next prime is 81427267. The reversal of 81427250 is 5272418.

It can be written as a sum of positive squares in 4 ways, for example, as 3087049 + 78340201 = 1757^2 + 8851^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162605 + ... + 163104.

Almost surely, 2^81427250 is an apocalyptic number.

81427250 is a deficient number, since it is larger than the sum of its proper divisors (71005030).

81427250 is a wasteful number, since it uses less digits than its factorization.

81427250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325726 (or 325716 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 81427250 is about 9023.7048932243. The cubic root of 81427250 is about 433.4342795725.

Adding to 81427250 its reverse (5272418), we get a palindrome (86699668).

The spelling of 81427250 in words is "eighty-one million, four hundred twenty-seven thousand, two hundred fifty".