81229402 has 8 divisors (see below), whose sum is σ = 122011200. Its totient is φ = 40559004.

The previous prime is 81229381. The next prime is 81229403. The reversal of 81229402 is 20492218.

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

It is not an unprimeable number, because it can be changed into a prime (81229403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26002 + ... + 28957.

It is an arithmetic number, because the mean of its divisors is an integer number (15251400).

Almost surely, 2^81229402 is an apocalyptic number.

81229402 is a deficient number, since it is larger than the sum of its proper divisors (40781798).

81229402 is a wasteful number, since it uses less digits than its factorization.

81229402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55700.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 81229402 is about 9012.7355447722. The cubic root of 81229402 is about 433.0829489759.

The spelling of 81229402 in words is "eighty-one million, two hundred twenty-nine thousand, four hundred two".