402689996280 has 768 divisors, whose sum is σ = 1680616304640. Its totient is φ = 82070323200.

The previous prime is 402689996257. The next prime is 402689996323. The reversal of 402689996280 is 82699986204.

402689996280 is a `hidden beast` number, since 4 + 0 + 268 + 9 + 9 + 96 + 280 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 27122539 + ... + 27137381.

It is an arithmetic number, because the mean of its divisors is an integer number (2188302480).

Almost surely, 2^402689996280 is an apocalyptic number.

402689996280 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 402689996280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (840308152320).

402689996280 is an abundant number, since it is smaller than the sum of its proper divisors (1277926308360).

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

402689996280 is a wasteful number, since it uses less digits than its factorization.

402689996280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14932 (or 14925 counting only the distinct ones).

The product of its (nonzero) digits is 26873856, while the sum is 63.

The spelling of 402689996280 in words is "four hundred two billion, six hundred eighty-nine million, nine hundred ninety-six thousand, two hundred eighty".