780240 has 40 divisors (see below), whose sum is σ = 2419488. Its totient is φ = 208000.

The previous prime is 780233. The next prime is 780253. The reversal of 780240 is 42087.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

780240 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1386 + ... + 1865.

2⁷⁸⁰²⁴⁰ is an apocalyptic number.

It is an amenable number.

780240 is an abundant number, since it is smaller than the sum of its proper divisors (1639248).

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

780240 is a wasteful number, since it uses less digits than its factorization.

780240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3267 (or 3261 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 780240 is about 883.3119494267. The cubic root of 780240 is about 92.0610810509.

The spelling of 780240 in words is "seven hundred eighty thousand, two hundred forty".