81069898 has 32 divisors (see below), whose sum is σ = 154506240. Its totient is φ = 31034880.

The previous prime is 81069881. The next prime is 81069899. The reversal of 81069898 is 89896018.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81069899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1543 + ... + 12826.

It is an arithmetic number, because the mean of its divisors is an integer number (4828320).

Almost surely, 2^81069898 is an apocalyptic number.

81069898 is a deficient number, since it is larger than the sum of its proper divisors (73436342).

81069898 is a wasteful number, since it uses less digits than its factorization.

81069898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14422.

The product of its (nonzero) digits is 248832, while the sum is 49.

The square root of 81069898 is about 9003.8823848382. The cubic root of 81069898 is about 432.7992925449.

The spelling of 81069898 in words is "eighty-one million, sixty-nine thousand, eight hundred ninety-eight".