81250286 has 32 divisors (see below), whose sum is σ = 136715040. Its totient is φ = 35957376.

The previous prime is 81250229. The next prime is 81250303. The reversal of 81250286 is 68205218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148265 + ... + 148811.

It is an arithmetic number, because the mean of its divisors is an integer number (4272345).

Almost surely, 2^81250286 is an apocalyptic number.

81250286 is a deficient number, since it is larger than the sum of its proper divisors (55464754).

81250286 is a wasteful number, since it uses less digits than its factorization.

81250286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 81250286 is about 9013.8940530716. The cubic root of 81250286 is about 433.1200608635.

The spelling of 81250286 in words is "eighty-one million, two hundred fifty thousand, two hundred eighty-six".