1630720755 has 48 divisors (see below), whose sum is σ = 2947037184. Its totient is φ = 865041120.

The previous prime is 1630720753. The next prime is 1630720759. The reversal of 1630720755 is 5570270361.

It is not a de Polignac number, because 1630720755 - 2¹ = 1630720753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1630720753) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 228552 + ... + 235578.

It is an arithmetic number, because the mean of its divisors is an integer number (61396608).

Almost surely, 2^1630720755 is an apocalyptic number.

1630720755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1630720755 is a deficient number, since it is larger than the sum of its proper divisors (1316316429).

1630720755 is an equidigital number, since it uses as much as digits as its factorization.

1630720755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7238 (or 7226 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 36.

The square root of 1630720755 is about 40382.1836333797. The cubic root of 1630720755 is about 1177.0453597990.

The spelling of 1630720755 in words is "one billion, six hundred thirty million, seven hundred twenty thousand, seven hundred fifty-five".