81252030 has 16 divisors (see below), whose sum is σ = 195004944. Its totient is φ = 21667200.

The previous prime is 81252029. The next prime is 81252047. The reversal of 81252030 is 3025218.

It is a junction number, because it is equal to n+sod(n) for n = 81251988 and 81252006.

It is a congruent number.

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, 1354171 + ... + 1354230.

It is an arithmetic number, because the mean of its divisors is an integer number (12187809).

Almost surely, 2^81252030 is an apocalyptic number.

81252030 is an abundant number, since it is smaller than the sum of its proper divisors (113752914).

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

81252030 is a wasteful number, since it uses less digits than its factorization.

81252030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2708411.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 81252030 is about 9013.9907920965. The cubic root of 81252030 is about 433.1231597489.

Adding to 81252030 its reverse (3025218), we get a palindrome (84277248).

The spelling of 81252030 in words is "eighty-one million, two hundred fifty-two thousand, thirty".