81267830 has 32 divisors (see below), whose sum is σ = 167512320. Its totient is φ = 27807840.

The previous prime is 81267817. The next prime is 81267881. The reversal of 81267830 is 3876218.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50945 + ... + 52515.

It is an arithmetic number, because the mean of its divisors is an integer number (5234760).

Almost surely, 2^81267830 is an apocalyptic number.

81267830 is an abundant number, since it is smaller than the sum of its proper divisors (86244490).

81267830 is a wasteful number, since it uses less digits than its factorization.

81267830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2324.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 81267830 is about 9014.8671648561. The cubic root of 81267830 is about 433.1512324932.

The spelling of 81267830 in words is "eighty-one million, two hundred sixty-seven thousand, eight hundred thirty".