287401990 has 16 divisors (see below), whose sum is σ = 520424352. Its totient is φ = 114271744.

The previous prime is 287401973. The next prime is 287401993. The reversal of 287401990 is 99104782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287401993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84379 + ... + 87718.

It is an arithmetic number, because the mean of its divisors is an integer number (32526522).

Almost surely, 2^287401990 is an apocalyptic number.

287401990 is a deficient number, since it is larger than the sum of its proper divisors (233022362).

287401990 is a wasteful number, since it uses less digits than its factorization.

287401990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172271.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 287401990 is about 16952.9345542298. The cubic root of 287401990 is about 659.9280530695.

The spelling of 287401990 in words is "two hundred eighty-seven million, four hundred one thousand, nine hundred ninety".