7987440 has 80 divisors (see below), whose sum is σ = 25855488. Its totient is φ = 2035968.

The previous prime is 7987439. The next prime is 7987457. The reversal of 7987440 is 447897.

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

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4797 + ... + 6243.

Almost surely, 2^7987440 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 7987440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12927744).

7987440 is an abundant number, since it is smaller than the sum of its proper divisors (17868048).

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

7987440 is a wasteful number, since it uses less digits than its factorization.

7987440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486 (or 1480 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 7987440 is about 2826.2059372947. The cubic root of 7987440 is about 199.8952785100.

The spelling of 7987440 in words is "seven million, nine hundred eighty-seven thousand, four hundred forty".