402866280 has 96 divisors (see below), whose sum is σ = 1312070760. Its totient is φ = 107205120.

The previous prime is 402866279. The next prime is 402866327. The reversal of 402866280 is 82668204.

402866280 is a `hidden beast` number, since 4 + 0 + 28 + 6 + 628 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 351112644 + 51753636 = 18738^2 + 7194^2 .

It is a super-2 number, since 2×402866280² = 324602479122076800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 237114 + ... + 238806.

Almost surely, 2^402866280 is an apocalyptic number.

402866280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402866280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (656035380).

402866280 is an abundant number, since it is smaller than the sum of its proper divisors (909204480).

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

402866280 is a wasteful number, since it uses less digits than its factorization.

402866280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2371 (or 2364 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 402866280 is about 20071.5290897330. The cubic root of 402866280 is about 738.5620236858.

The spelling of 402866280 in words is "four hundred two million, eight hundred sixty-six thousand, two hundred eighty".