1611639964 has 48 divisors (see below), whose sum is σ = 3307691520. Its totient is φ = 679224960.

The previous prime is 1611639961. The next prime is 1611639971. The reversal of 1611639964 is 4699361161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1611639961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18784 + ... + 59800.

It is an arithmetic number, because the mean of its divisors is an integer number (68910240).

Almost surely, 2^1611639964 is an apocalyptic number.

It is an amenable number.

1611639964 is an abundant number, since it is smaller than the sum of its proper divisors (1696051556).

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

1611639964 is a wasteful number, since it uses less digits than its factorization.

1611639964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41098 (or 41096 counting only the distinct ones).

The product of its digits is 209952, while the sum is 46.

The square root of 1611639964 is about 40145.2358817332. The cubic root of 1611639964 is about 1172.4365334053.

The spelling of 1611639964 in words is "one billion, six hundred eleven million, six hundred thirty-nine thousand, nine hundred sixty-four".