1617983478 has 32 divisors (see below), whose sum is σ = 3596836320. Its totient is φ = 539130240.

The previous prime is 1617983473. The next prime is 1617983503. The reversal of 1617983478 is 8743897161.

1617983478 is a `hidden beast` number, since 161 + 7 + 9 + 8 + 3 + 478 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1617983473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271426 + ... + 277322.

It is an arithmetic number, because the mean of its divisors is an integer number (112401135).

Almost surely, 2^1617983478 is an apocalyptic number.

1617983478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1617983478 is an abundant number, since it is smaller than the sum of its proper divisors (1978852842).

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

1617983478 is a wasteful number, since it uses less digits than its factorization.

1617983478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10989 (or 10983 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 1617983478 is about 40224.1653487055. The cubic root of 1617983478 is about 1173.9727803407.

The spelling of 1617983478 in words is "one billion, six hundred seventeen million, nine hundred eighty-three thousand, four hundred seventy-eight".