81423602 has 16 divisors (see below), whose sum is σ = 131893440. Its totient is φ = 37476432.

The previous prime is 81423571. The next prime is 81423613. The reversal of 81423602 is 20632418.

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 5723 + ... + 13985.

It is an arithmetic number, because the mean of its divisors is an integer number (8243340).

Almost surely, 2^81423602 is an apocalyptic number.

81423602 is a deficient number, since it is larger than the sum of its proper divisors (50469838).

81423602 is a wasteful number, since it uses less digits than its factorization.

81423602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8657.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 81423602 is about 9023.5027566904. The cubic root of 81423602 is about 433.4278067523.

The spelling of 81423602 in words is "eighty-one million, four hundred twenty-three thousand, six hundred two".