22987440 has 120 divisors (see below), whose sum is σ = 88247328. Its totient is φ = 5253120.

The previous prime is 22987439. The next prime is 22987463. The reversal of 22987440 is 4478922.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 22987395 and 22987404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2760 + ... + 7320.

Almost surely, 2^22987440 is an apocalyptic number.

22987440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22987440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44123664).

22987440 is an abundant number, since it is smaller than the sum of its proper divisors (65259888).

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

22987440 is a wasteful number, since it uses less digits than its factorization.

22987440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4587 (or 4578 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 22987440 is about 4794.5218739724. The cubic root of 22987440 is about 284.3349219371.

The spelling of 22987440 in words is "twenty-two million, nine hundred eighty-seven thousand, four hundred forty".