81240802 has 8 divisors (see below), whose sum is σ = 123230700. Its totient is φ = 40163904.

The previous prime is 81240787. The next prime is 81240821. The reversal of 81240802 is 20804218.

It can be written as a sum of positive squares in 2 ways, for example, as 78481881 + 2758921 = 8859^2 + 1661^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228027 + ... + 228382.

Almost surely, 2^81240802 is an apocalyptic number.

81240802 is a deficient number, since it is larger than the sum of its proper divisors (41989898).

81240802 is a wasteful number, since it uses less digits than its factorization.

81240802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456500.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 81240802 is about 9013.3679609788. The cubic root of 81240802 is about 433.1032081208.

It can be divided in two parts, 812 and 40802, that added together give a palindrome (41614).

The spelling of 81240802 in words is "eighty-one million, two hundred forty thousand, eight hundred two".