87043440 has 80 divisors (see below), whose sum is σ = 294374016. Its totient is φ = 21100800.

The previous prime is 87043399. The next prime is 87043447. The reversal of 87043440 is 4434078.

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

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 87043398 and 87043407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87043447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13846 + ... + 19125.

Almost surely, 2^87043440 is an apocalyptic number.

87043440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

87043440 is an abundant number, since it is smaller than the sum of its proper divisors (207330576).

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

87043440 is a wasteful number, since it uses less digits than its factorization.

87043440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32998 (or 32992 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 87043440 is about 9329.7073909100. The cubic root of 87043440 is about 443.1784988288.

The spelling of 87043440 in words is "eighty-seven million, forty-three thousand, four hundred forty".