1320631770 has 16 divisors (see below), whose sum is σ = 3169516320. Its totient is φ = 352168464.

The previous prime is 1320631729. The next prime is 1320631777. The reversal of 1320631770 is 771360231.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 44021059 = 1320631770 / (1 + 3 + 2 + 0 + 6 + 3 + 1 + 7 + 7 + 0).

It is not an unprimeable number, because it can be changed into a prime (1320631777) 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, 22010500 + ... + 22010559.

It is an arithmetic number, because the mean of its divisors is an integer number (198094770).

Almost surely, 2^1320631770 is an apocalyptic number.

1320631770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1320631770 is an abundant number, since it is smaller than the sum of its proper divisors (1848884550).

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

1320631770 is a wasteful number, since it uses less digits than its factorization.

1320631770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44021069.

The product of its (nonzero) digits is 5292, while the sum is 30.

The square root of 1320631770 is about 36340.4976575721. The cubic root of 1320631770 is about 1097.1362894543.

The spelling of 1320631770 in words is "one billion, three hundred twenty million, six hundred thirty-one thousand, seven hundred seventy".