81458036 has 12 divisors (see below), whose sum is σ = 155510880. Its totient is φ = 37026360.

The previous prime is 81458023. The next prime is 81458057. The reversal of 81458036 is 63085418.

It is a junction number, because it is equal to n+sod(n) for n = 81457987 and 81458005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 925616 + ... + 925703.

It is an arithmetic number, because the mean of its divisors is an integer number (12959240).

Almost surely, 2^81458036 is an apocalyptic number.

It is an amenable number.

81458036 is a deficient number, since it is larger than the sum of its proper divisors (74052844).

81458036 is a wasteful number, since it uses less digits than its factorization.

81458036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851334 (or 1851332 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 81458036 is about 9025.4105723784. The cubic root of 81458036 is about 433.4888969413.

The spelling of 81458036 in words is "eighty-one million, four hundred fifty-eight thousand, thirty-six".