287220144 has 40 divisors (see below), whose sum is σ = 755991792. Its totient is φ = 93932800.

The previous prime is 287220137. The next prime is 287220161. The reversal of 287220144 is 441022782.

It is a super-2 number, since 2×287220144² = 164990822238761472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53907 + ... + 58994.

Almost surely, 2^287220144 is an apocalyptic number.

287220144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

287220144 is an abundant number, since it is smaller than the sum of its proper divisors (468771648).

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

287220144 is a wasteful number, since it uses less digits than its factorization.

287220144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112965 (or 112959 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 30.

The square root of 287220144 is about 16947.5704453470. The cubic root of 287220144 is about 659.7888397030.

The spelling of 287220144 in words is "two hundred eighty-seven million, two hundred twenty thousand, one hundred forty-four".