81357862 has 8 divisors (see below), whose sum is σ = 124339536. Its totient is φ = 39911352.

The previous prime is 81357841. The next prime is 81357883. The reversal of 81357862 is 26875318.

It is an interprime number because it is at equal distance from previous prime (81357841) and next prime (81357883).

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

It is a super-2 number, since 2×81357862² = 13238203418422088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383658 + ... + 383869.

It is an arithmetic number, because the mean of its divisors is an integer number (15542442).

Almost surely, 2^81357862 is an apocalyptic number.

81357862 is a deficient number, since it is larger than the sum of its proper divisors (42981674).

81357862 is a wasteful number, since it uses less digits than its factorization.

81357862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767582.

The product of its digits is 80640, while the sum is 40.

The square root of 81357862 is about 9019.8593115414. The cubic root of 81357862 is about 433.3111279877.

The spelling of 81357862 in words is "eighty-one million, three hundred fifty-seven thousand, eight hundred sixty-two".