81674890 has 16 divisors (see below), whose sum is σ = 160380000. Its totient is φ = 29699920.

The previous prime is 81674881. The next prime is 81674891. The reversal of 81674890 is 9847618.

It is not an unprimeable number, because it can be changed into a prime (81674891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371140 + ... + 371359.

It is an arithmetic number, because the mean of its divisors is an integer number (10023750).

Almost surely, 2^81674890 is an apocalyptic number.

81674890 is a deficient number, since it is larger than the sum of its proper divisors (78705110).

81674890 is a wasteful number, since it uses less digits than its factorization.

81674890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742517.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 81674890 is about 9037.4161130270. The cubic root of 81674890 is about 433.8732277838.

The spelling of 81674890 in words is "eighty-one million, six hundred seventy-four thousand, eight hundred ninety".