81734774 has 36 divisors (see below), whose sum is σ = 138725916. Its totient is φ = 36082200.

The previous prime is 81734773. The next prime is 81734797. The reversal of 81734774 is 47743718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81734773) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1151159 + ... + 1151229.

Almost surely, 2^81734774 is an apocalyptic number.

81734774 is a deficient number, since it is larger than the sum of its proper divisors (56991142).

81734774 is a wasteful number, since it uses less digits than its factorization.

81734774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233 (or 151 counting only the distinct ones).

The product of its digits is 131712, while the sum is 41.

The square root of 81734774 is about 9040.7286210792. The cubic root of 81734774 is about 433.9792404435.

The spelling of 81734774 in words is "eighty-one million, seven hundred thirty-four thousand, seven hundred seventy-four".