16764237640 has 32 divisors (see below), whose sum is σ = 39020211000. Its totient is φ = 6474463744.

The previous prime is 16764237601. The next prime is 16764237649. The reversal of 16764237640 is 4673246761.

It can be written as a sum of positive squares in 4 ways, for example, as 13598824996 + 3165412644 = 116614^2 + 56262^2 .

It is not an unprimeable number, because it can be changed into a prime (16764237649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7224805 + ... + 7227124.

Almost surely, 2^16764237640 is an apocalyptic number.

16764237640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16764237640 is an abundant number, since it is smaller than the sum of its proper divisors (22255973360).

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

16764237640 is a wasteful number, since it uses less digits than its factorization.

16764237640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14451969 (or 14451965 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 46.

The spelling of 16764237640 in words is "sixteen billion, seven hundred sixty-four million, two hundred thirty-seven thousand, six hundred forty".