778140 has 96 divisors (see below), whose sum is σ = 2661120. Its totient is φ = 187200.

The previous prime is 778123. The next prime is 778153. The reversal of 778140 is 41877.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5875 + ... + 6005.

It is an arithmetic number, because the mean of its divisors is an integer number (27720).

2⁷⁷⁸¹⁴⁰ 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 778140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1330560).

778140 is an abundant number, since it is smaller than the sum of its proper divisors (1882980).

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

778140 is a wasteful number, since it uses less digits than its factorization.

778140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 778140 is about 882.1224404809. The cubic root of 778140 is about 91.9784133348.

The spelling of 778140 in words is "seven hundred seventy-eight thousand, one hundred forty".