287309725 has 12 divisors (see below), whose sum is σ = 358078644. Its totient is φ = 228677120.

The previous prime is 287309689. The next prime is 287309747. The reversal of 287309725 is 527903782.

It can be written as a sum of positive squares in 6 ways, for example, as 67469796 + 219839929 = 8214^2 + 14827^2 .

It is not a de Polignac number, because 287309725 - 2⁹ = 287309213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24244 + ... + 34093.

It is an arithmetic number, because the mean of its divisors is an integer number (29839887).

Almost surely, 2^287309725 is an apocalyptic number.

287309725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

287309725 is a deficient number, since it is larger than the sum of its proper divisors (70768919).

287309725 is a wasteful number, since it uses less digits than its factorization.

287309725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58544 (or 58539 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 287309725 is about 16950.2131255038. The cubic root of 287309725 is about 659.8574263506.

The spelling of 287309725 in words is "two hundred eighty-seven million, three hundred nine thousand, seven hundred twenty-five".