81244628 has 12 divisors (see below), whose sum is σ = 143264352. Its totient is φ = 40311960.

The previous prime is 81244621. The next prime is 81244651. The reversal of 81244628 is 82644218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81244621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77000 + ... + 78047.

It is an arithmetic number, because the mean of its divisors is an integer number (11938696).

Almost surely, 2^81244628 is an apocalyptic number.

It is an amenable number.

81244628 is a deficient number, since it is larger than the sum of its proper divisors (62019724).

81244628 is a wasteful number, since it uses less digits than its factorization.

81244628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155182 (or 155180 counting only the distinct ones).

The product of its digits is 24576, while the sum is 35.

The square root of 81244628 is about 9013.5801987889. The cubic root of 81244628 is about 433.1100069494.

The spelling of 81244628 in words is "eighty-one million, two hundred forty-four thousand, six hundred twenty-eight".