286478730 has 96 divisors (see below), whose sum is σ = 796118544. Its totient is φ = 71221248.

The previous prime is 286478711. The next prime is 286478737. The reversal of 286478730 is 37874682.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 52664049 + 233814681 = 7257^2 + 15291^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (286478737) 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 47 ways as a sum of consecutive naturals, for example, 172062 + ... + 173718.

Almost surely, 2^286478730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 286478730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (398059272).

286478730 is an abundant number, since it is smaller than the sum of its proper divisors (509639814).

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

286478730 is a wasteful number, since it uses less digits than its factorization.

286478730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1800 (or 1797 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The square root of 286478730 is about 16925.6825563993. The cubic root of 286478730 is about 659.2206365218.

The spelling of 286478730 in words is "two hundred eighty-six million, four hundred seventy-eight thousand, seven hundred thirty".