780640953 has 16 divisors (see below), whose sum is σ = 1101413376. Its totient is φ = 490785680.

The previous prime is 780640909. The next prime is 780640957. The reversal of 780640953 is 359046087.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 780640953 - 2¹⁰ = 780639929 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (780640957) 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, 74775 + ... + 84572.

It is an arithmetic number, because the mean of its divisors is an integer number (68838336).

Almost surely, 2^780640953 is an apocalyptic number.

It is an amenable number.

780640953 is a deficient number, since it is larger than the sum of its proper divisors (320772423).

780640953 is a wasteful number, since it uses less digits than its factorization.

780640953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159444.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 780640953 is about 27939.9526305969. The cubic root of 780640953 is about 920.7684792846.

The spelling of 780640953 in words is "seven hundred eighty million, six hundred forty thousand, nine hundred fifty-three".