81458073 has 12 divisors (see below), whose sum is σ = 123854640. Its totient is φ = 51447096.

The previous prime is 81458057. The next prime is 81458077. The reversal of 81458073 is 37085418.

81458073 is a `hidden beast` number, since 8 + 1 + 4 + 580 + 73 = 666.

It is not a de Polignac number, because 81458073 - 2⁴ = 81458057 is a prime.

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 in 11 ways as a sum of consecutive naturals, for example, 238011 + ... + 238352.

It is an arithmetic number, because the mean of its divisors is an integer number (10321220).

Almost surely, 2^81458073 is an apocalyptic number.

It is an amenable number.

81458073 is a deficient number, since it is larger than the sum of its proper divisors (42396567).

81458073 is a wasteful number, since it uses less digits than its factorization.

81458073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476388 (or 476385 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 81458073 is about 9025.4126221464. The cubic root of 81458073 is about 433.4889625746.

The spelling of 81458073 in words is "eighty-one million, four hundred fifty-eight thousand, seventy-three".