1630455778 has 24 divisors (see below), whose sum is σ = 2949927552. Its totient is φ = 661987512.

The previous prime is 1630455773. The next prime is 1630455779. The reversal of 1630455778 is 8775540361.

It is not an unprimeable number, because it can be changed into a prime (1630455773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 156250 + ... + 166357.

It is an arithmetic number, because the mean of its divisors is an integer number (122913648).

Almost surely, 2^1630455778 is an apocalyptic number.

1630455778 is a deficient number, since it is larger than the sum of its proper divisors (1319471774).

1630455778 is a wasteful number, since it uses less digits than its factorization.

1630455778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322654 (or 322635 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 46.

The square root of 1630455778 is about 40378.9026349157. The cubic root of 1630455778 is about 1176.9816033604.

The spelling of 1630455778 in words is "one billion, six hundred thirty million, four hundred fifty-five thousand, seven hundred seventy-eight".