81250285 has 8 divisors (see below), whose sum is σ = 97728120. Its totient is φ = 64848384.

The previous prime is 81250229. The next prime is 81250303. The reversal of 81250285 is 58205218.

It can be written as a sum of positive squares in 4 ways, for example, as 3493161 + 77757124 = 1869^2 + 8818^2 .

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-81250285 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16600 + ... + 20929.

It is an arithmetic number, because the mean of its divisors is an integer number (12216015).

Almost surely, 2^81250285 is an apocalyptic number.

It is an amenable number.

81250285 is a deficient number, since it is larger than the sum of its proper divisors (16477835).

81250285 is a wasteful number, since it uses less digits than its factorization.

81250285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37967.

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 81250285 is about 9013.8939976017. The cubic root of 81250285 is about 433.1200590866.

The spelling of 81250285 in words is "eighty-one million, two hundred fifty thousand, two hundred eighty-five".