81006357 has 8 divisors (see below), whose sum is σ = 110927776. Its totient is φ = 52544592.

The previous prime is 81006301. The next prime is 81006361. The reversal of 81006357 is 75360018.

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

It is not a de Polignac number, because 81006357 - 2¹² = 81002261 is a prime.

It is a super-2 number, since 2×81006357² = 13124059748822898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81006397) 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, 364783 + ... + 365004.

It is an arithmetic number, because the mean of its divisors is an integer number (13865972).

Almost surely, 2^81006357 is an apocalyptic number.

It is an amenable number.

81006357 is a deficient number, since it is larger than the sum of its proper divisors (29921419).

81006357 is a wasteful number, since it uses less digits than its factorization.

81006357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729827.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 81006357 is about 9000.3531597377. The cubic root of 81006357 is about 432.6861897844.

The spelling of 81006357 in words is "eighty-one million, six thousand, three hundred fifty-seven".