287129412 has 18 divisors (see below), whose sum is σ = 725799438. Its totient is φ = 95709792.

The previous prime is 287129383. The next prime is 287129419. The reversal of 287129412 is 214921782.

It can be written as a sum of positive squares in only one way, i.e., 287099136 + 30276 = 16944^2 + 174^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 7975817 = 287129412 / (2 + 8 + 7 + 1 + 2 + 9 + 4 + 1 + 2).

It is not an unprimeable number, because it can be changed into a prime (287129419) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3987873 + ... + 3987944.

It is an arithmetic number, because the mean of its divisors is an integer number (40322191).

Almost surely, 2^287129412 is an apocalyptic number.

It is an amenable number.

287129412 is an abundant number, since it is smaller than the sum of its proper divisors (438670026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

287129412 is a wasteful number, since it uses less digits than its factorization.

287129412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7975827 (or 7975822 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 287129412 is about 16944.8933900453. The cubic root of 287129412 is about 659.7193572671.

The spelling of 287129412 in words is "two hundred eighty-seven million, one hundred twenty-nine thousand, four hundred twelve".