87743440 has 20 divisors (see below), whose sum is σ = 204003684. Its totient is φ = 35097344.

The previous prime is 87743429. The next prime is 87743441. The reversal of 87743440 is 4434778.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9314704 + 78428736 = 3052^2 + 8856^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×87743440² = 15397822526067200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87743440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87743441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548317 + ... + 548476.

Almost surely, 2^87743440 is an apocalyptic number.

87743440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

87743440 is an abundant number, since it is smaller than the sum of its proper divisors (116260244).

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

87743440 is a wasteful number, since it uses less digits than its factorization.

87743440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096806 (or 1096800 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 37.

The square root of 87743440 is about 9367.1468441570. The cubic root of 87743440 is about 444.3633364956.

The spelling of 87743440 in words is "eighty-seven million, seven hundred forty-three thousand, four hundred forty".