287400872 has 32 divisors (see below), whose sum is σ = 588578400. Its totient is φ = 130478400.

The previous prime is 287400871. The next prime is 287400889. The reversal of 287400872 is 278004782.

It is a super-2 number, since 2×287400872² = 165198522452720768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (287400871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101654 + ... + 104442.

It is an arithmetic number, because the mean of its divisors is an integer number (18393075).

Almost surely, 2^287400872 is an apocalyptic number.

287400872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

287400872 is an abundant number, since it is smaller than the sum of its proper divisors (301177528).

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

287400872 is a wasteful number, since it uses less digits than its factorization.

287400872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3977 (or 3973 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 287400872 is about 16952.9015805555. The cubic root of 287400872 is about 659.9271973569.

The spelling of 287400872 in words is "two hundred eighty-seven million, four hundred thousand, eight hundred seventy-two".