1613990640 has 80 divisors (see below), whose sum is σ = 5007715200. Its totient is φ = 430023936.

The previous prime is 1613990617. The next prime is 1613990641. The reversal of 1613990640 is 460993161.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1613990641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 376831 + ... + 381089.

It is an arithmetic number, because the mean of its divisors is an integer number (62596440).

Almost surely, 2^1613990640 is an apocalyptic number.

1613990640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1613990640 is an abundant number, since it is smaller than the sum of its proper divisors (3393724560).

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

1613990640 is a wasteful number, since it uses less digits than its factorization.

1613990640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5854 (or 5848 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 1613990640 is about 40174.5023615726. The cubic root of 1613990640 is about 1173.0062800869.

The spelling of 1613990640 in words is "one billion, six hundred thirteen million, nine hundred ninety thousand, six hundred forty".