81249060 has 48 divisors (see below), whose sum is σ = 227900736. Its totient is φ = 21628032.

The previous prime is 81249037. The next prime is 81249067. The reversal of 81249060 is 6094218.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (81249067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53674 + ... + 55166.

It is an arithmetic number, because the mean of its divisors is an integer number (4747932).

Almost surely, 2^81249060 is an apocalyptic number.

It is an amenable number.

81249060 is an abundant number, since it is smaller than the sum of its proper divisors (146651676).

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

81249060 is a wasteful number, since it uses less digits than its factorization.

81249060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2412 (or 2410 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 81249060 is about 9013.8260466907. The cubic root of 81249060 is about 433.1178823773.

The spelling of 81249060 in words is "eighty-one million, two hundred forty-nine thousand, sixty".