780990 has 32 divisors (see below), whose sum is σ = 2142720. Its totient is φ = 178464.

The previous prime is 780973. The next prime is 780991. The reversal of 780990 is 99087.

780990 is nontrivially palindromic in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1650 + ... + 2069.

It is an arithmetic number, because the mean of its divisors is an integer number (66960).

2⁷⁸⁰⁹⁹⁰ is an apocalyptic number.

780990 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

780990 is an abundant number, since it is smaller than the sum of its proper divisors (1361730).

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

780990 is a wasteful number, since it uses less digits than its factorization.

780990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3736.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 780990 is about 883.7363860338. The cubic root of 780990 is about 92.0905692850.

It can be divided in two parts, 780 and 990, that added together give a triangular number (1770 = T₅₉).

The spelling of 780990 in words is "seven hundred eighty thousand, nine hundred ninety".