287861425 has 12 divisors (see below), whose sum is σ = 377945676. Its totient is φ = 216742400.

The previous prime is 287861383. The next prime is 287861449. The reversal of 287861425 is 524168782.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 14653584 + 273207841 = 3828^2 + 16529^2 .

It is not a de Polignac number, because 287861425 - 2⁷ = 287861297 is a prime.

It is a Duffinian 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, 338236 + ... + 339085.

It is an arithmetic number, because the mean of its divisors is an integer number (31495473).

Almost surely, 2^287861425 is an apocalyptic number.

287861425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

287861425 is a deficient number, since it is larger than the sum of its proper divisors (90084251).

287861425 is a wasteful number, since it uses less digits than its factorization.

287861425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677348 (or 677343 counting only the distinct ones).

The product of its digits is 215040, while the sum is 43.

The square root of 287861425 is about 16966.4794521433. The cubic root of 287861425 is about 660.2795150623.

The spelling of 287861425 in words is "two hundred eighty-seven million, eight hundred sixty-one thousand, four hundred twenty-five".