780649252 has 6 divisors (see below), whose sum is σ = 1366136198. Its totient is φ = 390324624.

The previous prime is 780649249. The next prime is 780649253. The reversal of 780649252 is 252946087.

It can be written as a sum of positive squares in only one way, i.e., 505620196 + 275029056 = 22486^2 + 16584^2 .

It is a junction number, because it is equal to n+sod(n) for n = 780649199 and 780649208.

It is not an unprimeable number, because it can be changed into a prime (780649253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97581153 + ... + 97581160.

Almost surely, 2^780649252 is an apocalyptic number.

It is an amenable number.

780649252 is a deficient number, since it is larger than the sum of its proper divisors (585486946).

780649252 is a wasteful number, since it uses less digits than its factorization.

780649252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195162317 (or 195162315 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 780649252 is about 27940.1011451283. The cubic root of 780649252 is about 920.7717421720.

The spelling of 780649252 in words is "seven hundred eighty million, six hundred forty-nine thousand, two hundred fifty-two".