81618074 has 8 divisors (see below), whose sum is σ = 123391488. Its totient is φ = 40487580.

The previous prime is 81618013. The next prime is 81618079. The reversal of 81618074 is 47081618.

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 (81618079) 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, 160412 + ... + 160919.

It is an arithmetic number, because the mean of its divisors is an integer number (15423936).

Almost surely, 2^81618074 is an apocalyptic number.

81618074 is a deficient number, since it is larger than the sum of its proper divisors (41773414).

81618074 is a wasteful number, since it uses less digits than its factorization.

81618074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321460.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 81618074 is about 9034.2721898336. The cubic root of 81618074 is about 433.7725984898.

The spelling of 81618074 in words is "eighty-one million, six hundred eighteen thousand, seventy-four".