87403240 has 64 divisors (see below), whose sum is σ = 202286160. Its totient is φ = 33976320.

The previous prime is 87403231. The next prime is 87403241. The reversal of 87403240 is 4230478.

It can be written as a sum of positive squares in 8 ways, for example, as 3020644 + 84382596 = 1738^2 + 9186^2 .

It is a junction number, because it is equal to n+sod(n) for n = 87403199 and 87403208.

It is not an unprimeable number, because it can be changed into a prime (87403241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275562 + ... + 275878.

Almost surely, 2^87403240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87403240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101143080).

87403240 is an abundant number, since it is smaller than the sum of its proper divisors (114882920).

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

87403240 is a wasteful number, since it uses less digits than its factorization.

87403240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502 (or 498 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 87403240 is about 9348.9699967430. The cubic root of 87403240 is about 443.7882955775.

The spelling of 87403240 in words is "eighty-seven million, four hundred three thousand, two hundred forty".