1639533672 has 48 divisors (see below), whose sum is σ = 5074748640. Its totient is φ = 468438048.

The previous prime is 1639533671. The next prime is 1639533683. The reversal of 1639533672 is 2763359361.

1639533672 is a `hidden beast` number, since 1 + 639 + 5 + 3 + 3 + 6 + 7 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (1639533671) 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, 1626018 + ... + 1627025.

It is an arithmetic number, because the mean of its divisors is an integer number (105723930).

Almost surely, 2^1639533672 is an apocalyptic number.

1639533672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1639533672 is an abundant number, since it is smaller than the sum of its proper divisors (3435214968).

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

1639533672 is a wasteful number, since it uses less digits than its factorization.

1639533672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3253062 (or 3253055 counting only the distinct ones).

The product of its digits is 612360, while the sum is 45.

The square root of 1639533672 is about 40491.1554786968. The cubic root of 1639533672 is about 1179.1619233434.

The spelling of 1639533672 in words is "one billion, six hundred thirty-nine million, five hundred thirty-three thousand, six hundred seventy-two".