287920478290 has 16 divisors (see below), whose sum is σ = 530897272920. Its totient is φ = 112359210880.

The previous prime is 287920478273. The next prime is 287920478297. The reversal of 287920478290 is 92874029782.

It can be written as a sum of positive squares in 4 ways, for example, as 189831875809 + 98088602481 = 435697^2 + 313191^2 .

It is a super-2 number, since 2×287920478290² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (287920478297) 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, 351122125 + ... + 351122944.

Almost surely, 2^287920478290 is an apocalyptic number.

287920478290 is a deficient number, since it is larger than the sum of its proper divisors (242976794630).

287920478290 is a wasteful number, since it uses less digits than its factorization.

287920478290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702245117.

The product of its (nonzero) digits is 8128512, while the sum is 58.

The spelling of 287920478290 in words is "two hundred eighty-seven billion, nine hundred twenty million, four hundred seventy-eight thousand, two hundred ninety".