6407780 has 12 divisors (see below), whose sum is σ = 13456380. Its totient is φ = 2563104.

The previous prime is 6407773. The next prime is 6407809. The reversal of 6407780 is 877046.

It can be written as a sum of positive squares in 2 ways, for example, as 4169764 + 2238016 = 2042^2 + 1496^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160175 + ... + 160214.

It is an arithmetic number, because the mean of its divisors is an integer number (1121365).

Almost surely, 2^6407780 is an apocalyptic number.

It is an amenable number.

6407780 is an abundant number, since it is smaller than the sum of its proper divisors (7048600).

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

6407780 is a wasteful number, since it uses less digits than its factorization.

6407780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320398 (or 320396 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 6407780 is about 2531.3593186270. The cubic root of 6407780 is about 185.7387552993.

The spelling of 6407780 in words is "six million, four hundred seven thousand, seven hundred eighty".