780857672 has 32 divisors (see below), whose sum is σ = 1675833600. Its totient is φ = 334139904.

The previous prime is 780857653. The next prime is 780857677. The reversal of 780857672 is 276758087.

It is a self number, because there is not a number n which added to its sum of digits gives 780857672.

It is not an unprimeable number, because it can be changed into a prime (780857677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27329 + ... + 48047.

It is an arithmetic number, because the mean of its divisors is an integer number (52369800).

Almost surely, 2^780857672 is an apocalyptic number.

It is an amenable number.

780857672 is an abundant number, since it is smaller than the sum of its proper divisors (894975928).

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

780857672 is a wasteful number, since it uses less digits than its factorization.

780857672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21405 (or 21401 counting only the distinct ones).

The product of its (nonzero) digits is 1317120, while the sum is 50.

The square root of 780857672 is about 27943.8306608096. The cubic root of 780857672 is about 920.8536783167.

The spelling of 780857672 in words is "seven hundred eighty million, eight hundred fifty-seven thousand, six hundred seventy-two".