1638271485 has 96 divisors (see below), whose sum is σ = 3141365760. Its totient is φ = 786132864.

The previous prime is 1638271483. The next prime is 1638271493. The reversal of 1638271485 is 5841728361.

1638271485 is a `hidden beast` number, since 1 + 638 + 2 + 7 + 1 + 4 + 8 + 5 = 666.

It is not a de Polignac number, because 1638271485 - 2¹ = 1638271483 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1638271485.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638271483) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4463772 + ... + 4464138.

It is an arithmetic number, because the mean of its divisors is an integer number (32722560).

Almost surely, 2^1638271485 is an apocalyptic number.

1638271485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1638271485 is a deficient number, since it is larger than the sum of its proper divisors (1503094275).

1638271485 is a wasteful number, since it uses less digits than its factorization.

1638271485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647 (or 644 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 1638271485 is about 40475.5665185801. The cubic root of 1638271485 is about 1178.8592549759.

The spelling of 1638271485 in words is "one billion, six hundred thirty-eight million, two hundred seventy-one thousand, four hundred eighty-five".