81250010 has 16 divisors (see below), whose sum is σ = 146670696. Its totient is φ = 32406528.

The previous prime is 81249997. The next prime is 81250019. The reversal of 81250010 is 1005218.

It can be written as a sum of positive squares in 4 ways, for example, as 62837329 + 18412681 = 7927^2 + 4291^2 .

It is not an unprimeable number, because it can be changed into a prime (81250019) 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, 7979 + ... + 15038.

Almost surely, 2^81250010 is an apocalyptic number.

81250010 is a deficient number, since it is larger than the sum of its proper divisors (65420686).

81250010 is a wasteful number, since it uses less digits than its factorization.

81250010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23377.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 81250010 is about 9013.8787433602. The cubic root of 81250010 is about 433.1195704395.

Adding to 81250010 its reverse (1005218), we get a palindrome (82255228).

The spelling of 81250010 in words is "eighty-one million, two hundred fifty thousand, ten".