1320776638 has 32 divisors (see below), whose sum is σ = 2137685760. Its totient is φ = 610606080.

The previous prime is 1320776627. The next prime is 1320776671. The reversal of 1320776638 is 8366770231.

It is a junction number, because it is equal to n+sod(n) for n = 1320776594 and 1320776603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170620 + ... + 178192.

It is an arithmetic number, because the mean of its divisors is an integer number (66802680).

Almost surely, 2^1320776638 is an apocalyptic number.

1320776638 is a deficient number, since it is larger than the sum of its proper divisors (816909122).

1320776638 is a wasteful number, since it uses less digits than its factorization.

1320776638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7732.

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 1320776638 is about 36342.4908062175. The cubic root of 1320776638 is about 1097.1764051354.

The spelling of 1320776638 in words is "one billion, three hundred twenty million, seven hundred seventy-six thousand, six hundred thirty-eight".