81358502 has 8 divisors (see below), whose sum is σ = 123859416. Its totient is φ = 40072032.

The previous prime is 81358493. The next prime is 81358517. The reversal of 81358502 is 20585318.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 303443 + ... + 303710.

It is an arithmetic number, because the mean of its divisors is an integer number (15482427).

Almost surely, 2^81358502 is an apocalyptic number.

81358502 is a deficient number, since it is larger than the sum of its proper divisors (42500914).

81358502 is a wasteful number, since it uses less digits than its factorization.

81358502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607222.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 81358502 is about 9019.8947887434. The cubic root of 81358502 is about 433.3122641959.

The spelling of 81358502 in words is "eighty-one million, three hundred fifty-eight thousand, five hundred two".