780391628 has 12 divisors (see below), whose sum is σ = 1376111352. Its totient is φ = 387216960.

The previous prime is 780391621. The next prime is 780391631. The reversal of 780391628 is 826193087.

780391628 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×780391628² = 1218022186104980768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (780391621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 744125 + ... + 745172.

It is an arithmetic number, because the mean of its divisors is an integer number (114675946).

Almost surely, 2^780391628 is an apocalyptic number.

It is an amenable number.

780391628 is a deficient number, since it is larger than the sum of its proper divisors (595719724).

780391628 is a wasteful number, since it uses less digits than its factorization.

780391628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489432 (or 1489430 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 780391628 is about 27935.4904735893. The cubic root of 780391628 is about 920.6704423040.

The spelling of 780391628 in words is "seven hundred eighty million, three hundred ninety-one thousand, six hundred twenty-eight".