780998 has 4 divisors (see below), whose sum is σ = 1171500. Its totient is φ = 390498.

The previous prime is 780991. The next prime is 781003. The reversal of 780998 is 899087.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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

780998 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 as a sum of consecutive naturals, namely, 195248 + ... + 195251.

It is an arithmetic number, because the mean of its divisors is an integer number (292875).

2⁷⁸⁰⁹⁹⁸ is an apocalyptic number.

780998 is a deficient number, since it is larger than the sum of its proper divisors (390502).

780998 is a wasteful number, since it uses less digits than its factorization.

780998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390501.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 780998 is about 883.7409122588. The cubic root of 780998 is about 92.0908837244.

The spelling of 780998 in words is "seven hundred eighty thousand, nine hundred ninety-eight".