780451016 has 32 divisors (see below), whose sum is σ = 1516347000. Its totient is φ = 376137216.

The previous prime is 780451013. The next prime is 780451037. The reversal of 780451016 is 610154087.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 753722116 + 26728900 = 27454^2 + 5170^2 .

It is not an unprimeable number, because it can be changed into a prime (780451013) 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, 154580 + ... + 159548.

Almost surely, 2^780451016 is an apocalyptic number.

It is an amenable number.

780451016 is a deficient number, since it is larger than the sum of its proper divisors (735895984).

780451016 is a wasteful number, since it uses less digits than its factorization.

780451016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5681 (or 5677 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 780451016 is about 27936.5534023079. The cubic root of 780451016 is about 920.6937961293.

The spelling of 780451016 in words is "seven hundred eighty million, four hundred fifty-one thousand, sixteen".