287420784 has 40 divisors (see below), whose sum is σ = 848576640. Its totient is φ = 82120128.

The previous prime is 287420767. The next prime is 287420789. The reversal of 287420784 is 487024782.

It is a super-2 number, since 2×287420784² = 165221414150349312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287420789) 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, 427374 + ... + 428045.

It is an arithmetic number, because the mean of its divisors is an integer number (21214416).

Almost surely, 2^287420784 is an apocalyptic number.

287420784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

287420784 is an abundant number, since it is smaller than the sum of its proper divisors (561155856).

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

287420784 is a wasteful number, since it uses less digits than its factorization.

287420784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855437 (or 855431 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 42.

The square root of 287420784 is about 16953.4888444827. The cubic root of 287420784 is about 659.9424375877.

The spelling of 287420784 in words is "two hundred eighty-seven million, four hundred twenty thousand, seven hundred eighty-four".