1630720845 has 24 divisors (see below), whose sum is σ = 3044013336. Its totient is φ = 802816128.

The previous prime is 1630720831. The next prime is 1630720859. The reversal of 1630720845 is 5480270361.

1630720845 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1630720831) and next prime (1630720859).

It can be written as a sum of positive squares in 4 ways, for example, as 660969 + 1630059876 = 813^2 + 40374^2 .

It is not a de Polignac number, because 1630720845 - 2⁵ = 1630720813 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1393194 + ... + 1394363.

It is an arithmetic number, because the mean of its divisors is an integer number (126833889).

Almost surely, 2^1630720845 is an apocalyptic number.

1630720845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1630720845 is a deficient number, since it is larger than the sum of its proper divisors (1413292491).

1630720845 is a wasteful number, since it uses less digits than its factorization.

1630720845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2787581 (or 2787578 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 1630720845 is about 40382.1847477325. The cubic root of 1630720845 is about 1177.0453814528.

The spelling of 1630720845 in words is "one billion, six hundred thirty million, seven hundred twenty thousand, eight hundred forty-five".