402780708 has 96 divisors (see below), whose sum is σ = 1160853120. Its totient is φ = 119733120.

The previous prime is 402780701. The next prime is 402780709. The reversal of 402780708 is 807087204.

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

It is not an unprimeable number, because it can be changed into a prime (402780701) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59766 + ... + 66162.

It is an arithmetic number, because the mean of its divisors is an integer number (12092220).

Almost surely, 2^402780708 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402780708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (580426560).

402780708 is an abundant number, since it is smaller than the sum of its proper divisors (758072412).

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

402780708 is a wasteful number, since it uses less digits than its factorization.

402780708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6474 (or 6466 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 402780708 is about 20069.3973003675. The cubic root of 402780708 is about 738.5097278348.

The spelling of 402780708 in words is "four hundred two million, seven hundred eighty thousand, seven hundred eight".