81528702 has 16 divisors (see below), whose sum is σ = 172649232. Its totient is φ = 25577600.

The previous prime is 81528701. The next prime is 81528703. The reversal of 81528702 is 20782518.

It is an interprime number because it is at equal distance from previous prime (81528701) and next prime (81528703).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81528701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399549 + ... + 399752.

It is an arithmetic number, because the mean of its divisors is an integer number (10790577).

Almost surely, 2^81528702 is an apocalyptic number.

81528702 is an abundant number, since it is smaller than the sum of its proper divisors (91120530).

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

81528702 is a wasteful number, since it uses less digits than its factorization.

81528702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799323.

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 81528702 is about 9029.3245594563. The cubic root of 81528702 is about 433.6142132964.

The spelling of 81528702 in words is "eighty-one million, five hundred twenty-eight thousand, seven hundred two".