81423502 has 8 divisors (see below), whose sum is σ = 122455296. Its totient is φ = 40605072.

The previous prime is 81423479. The next prime is 81423521. The reversal of 81423502 is 20532418.

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

It is a congruent number.

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, 52383 + ... + 53914.

It is an arithmetic number, because the mean of its divisors is an integer number (15306912).

Almost surely, 2^81423502 is an apocalyptic number.

81423502 is a deficient number, since it is larger than the sum of its proper divisors (41031794).

81423502 is a wasteful number, since it uses less digits than its factorization.

81423502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106682.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 81423502 is about 9023.4972156033. The cubic root of 81423502 is about 433.4276293148.

The spelling of 81423502 in words is "eighty-one million, four hundred twenty-three thousand, five hundred two".