81458074 has 4 divisors (see below), whose sum is σ = 122187114. Its totient is φ = 40729036.

The previous prime is 81458057. The next prime is 81458077. The reversal of 81458074 is 47085418.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 77316849 + 4141225 = 8793^2 + 2035^2 .

It is not an unprimeable number, because it can be changed into a prime (81458077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20364517 + ... + 20364520.

Almost surely, 2^81458074 is an apocalyptic number.

81458074 is a deficient number, since it is larger than the sum of its proper divisors (40729040).

81458074 is a wasteful number, since it uses less digits than its factorization.

81458074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40729039.

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 81458074 is about 9025.4126775456. The cubic root of 81458074 is about 433.4889643485.

The spelling of 81458074 in words is "eighty-one million, four hundred fifty-eight thousand, seventy-four".