87843640 has 16 divisors (see below), whose sum is σ = 197648280. Its totient is φ = 35137440.

The previous prime is 87843619. The next prime is 87843643. The reversal of 87843640 is 4634878.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 2196091 = 87843640 / (8 + 7 + 8 + 4 + 3 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 87843593 and 87843602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87843643) 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 3 ways as a sum of consecutive naturals, for example, 1098006 + ... + 1098085.

Almost surely, 2^87843640 is an apocalyptic number.

It is an amenable number.

87843640 is an abundant number, since it is smaller than the sum of its proper divisors (109804640).

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

87843640 is a wasteful number, since it uses less digits than its factorization.

87843640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2196102 (or 2196098 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 87843640 is about 9372.4937983442. The cubic root of 87843640 is about 444.5324213803.

The spelling of 87843640 in words is "eighty-seven million, eight hundred forty-three thousand, six hundred forty".