81002484 has 48 divisors (see below), whose sum is σ = 222364800. Its totient is φ = 25411968.

The previous prime is 81002477. The next prime is 81002489. The reversal of 81002484 is 48420018.

It is a super-2 number, since 2×81002484² = 13122804828340512, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81002489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20224 + ... + 23895.

It is an arithmetic number, because the mean of its divisors is an integer number (4632600).

Almost surely, 2^81002484 is an apocalyptic number.

It is an amenable number.

81002484 is an abundant number, since it is smaller than the sum of its proper divisors (141362316).

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

81002484 is a wasteful number, since it uses less digits than its factorization.

81002484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44149 (or 44141 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 81002484 is about 9000.1379989420. The cubic root of 81002484 is about 432.6792939457.

The spelling of 81002484 in words is "eighty-one million, two thousand, four hundred eighty-four".