81612214 has 16 divisors (see below), whose sum is σ = 124945920. Its totient is φ = 39971880.

The previous prime is 81612203. The next prime is 81612227. The reversal of 81612214 is 41221618.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18727 + ... + 22669.

It is an arithmetic number, because the mean of its divisors is an integer number (7809120).

Almost surely, 2^81612214 is an apocalyptic number.

81612214 is a deficient number, since it is larger than the sum of its proper divisors (43333706).

81612214 is a wasteful number, since it uses less digits than its factorization.

81612214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4155.

The product of its digits is 768, while the sum is 25.

The square root of 81612214 is about 9033.9478634759. The cubic root of 81612214 is about 433.7622169320.

The spelling of 81612214 in words is "eighty-one million, six hundred twelve thousand, two hundred fourteen".