780340392 has 160 divisors (see below), whose sum is σ = 2492721000. Its totient is φ = 225939456.

The previous prime is 780340391. The next prime is 780340403. The reversal of 780340392 is 293043087.

It can be written as a sum of positive squares in 4 ways, for example, as 479872836 + 300467556 = 21906^2 + 17334^2 .

It is a super-2 number, since 2×780340392² = 1217862254773427328, which contains 22 as substring.

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 (780340391) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 140484 + ... + 145932.

Almost surely, 2^780340392 is an apocalyptic number.

780340392 is a gapful number since it is divisible by the number (72) 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 780340392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1246360500).

780340392 is an abundant number, since it is smaller than the sum of its proper divisors (1712380608).

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

780340392 is a wasteful number, since it uses less digits than its factorization.

780340392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5497 (or 5484 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 780340392 is about 27934.5734171832. The cubic root of 780340392 is about 920.6502932312.

The spelling of 780340392 in words is "seven hundred eighty million, three hundred forty thousand, three hundred ninety-two".