81745034 has 12 divisors (see below), whose sum is σ = 142636914. Its totient is φ = 35033544.

The previous prime is 81745009. The next prime is 81745039. The reversal of 81745034 is 43054718.

It can be written as a sum of positive squares in only one way, i.e., 67190809 + 14554225 = 8197^2 + 3815^2 .

It is a super-2 number, since 2×81745034² = 13364501167322312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81745039) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 416969 + ... + 417164.

Almost surely, 2^81745034 is an apocalyptic number.

81745034 is a deficient number, since it is larger than the sum of its proper divisors (60891880).

81745034 is a wasteful number, since it uses less digits than its factorization.

81745034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834149 (or 834142 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 81745034 is about 9041.2960354144. The cubic root of 81745034 is about 433.9973985276.

The spelling of 81745034 in words is "eighty-one million, seven hundred forty-five thousand, thirty-four".