157287305 has 24 divisors (see below), whose sum is σ = 223721352. Its totient is φ = 105810432.

The previous prime is 157287293. The next prime is 157287307. The reversal of 157287305 is 503782751.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17172736 + 140114569 = 4144^2 + 11837^2 .

It is not a de Polignac number, because 157287305 - 2⁴ = 157287289 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157287307) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6929 + ... + 19041.

It is an arithmetic number, because the mean of its divisors is an integer number (9321723).

Almost surely, 2^157287305 is an apocalyptic number.

It is an amenable number.

157287305 is a deficient number, since it is larger than the sum of its proper divisors (66434047).

157287305 is a wasteful number, since it uses less digits than its factorization.

157287305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12185 (or 12178 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 38.

The square root of 157287305 is about 12541.4235635354. The cubic root of 157287305 is about 539.7979410919.

The spelling of 157287305 in words is "one hundred fifty-seven million, two hundred eighty-seven thousand, three hundred five".