81869460 has 24 divisors (see below), whose sum is σ = 229234656. Its totient is φ = 21831840.

The previous prime is 81869453. The next prime is 81869507. The reversal of 81869460 is 6496818.

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, 682186 + ... + 682305.

It is an arithmetic number, because the mean of its divisors is an integer number (9551444).

Almost surely, 2^81869460 is an apocalyptic number.

It is an amenable number.

81869460 is an abundant number, since it is smaller than the sum of its proper divisors (147365196).

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

81869460 is a wasteful number, since it uses less digits than its factorization.

81869460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364503 (or 1364501 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 81869460 is about 9048.1744015022. The cubic root of 81869460 is about 434.2174860457.

The spelling of 81869460 in words is "eighty-one million, eight hundred sixty-nine thousand, four hundred sixty".