81062357 has 8 divisors (see below), whose sum is σ = 83721600. Its totient is φ = 78442144.

The previous prime is 81062329. The next prime is 81062369. The reversal of 81062357 is 75326018.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81062357 is a prime.

It is a super-2 number, since 2×81062357² = 13142211444790898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81062057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5507 + ... + 13872.

It is an arithmetic number, because the mean of its divisors is an integer number (10465200).

Almost surely, 2^81062357 is an apocalyptic number.

It is an amenable number.

81062357 is a deficient number, since it is larger than the sum of its proper divisors (2659243).

81062357 is a wasteful number, since it uses less digits than its factorization.

81062357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19515.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 81062357 is about 9003.4636112998. The cubic root of 81062357 is about 432.7858726823.

The spelling of 81062357 in words is "eighty-one million, sixty-two thousand, three hundred fifty-seven".