2621616 has 20 divisors (see below), whose sum is σ = 6772632. Its totient is φ = 873856.

The previous prime is 2621611. The next prime is 2621617. The reversal of 2621616 is 6161262.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (2621611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27261 + ... + 27356.

2^2621616 is an apocalyptic number.

It is an amenable number.

2621616 is an abundant number, since it is smaller than the sum of its proper divisors (4151016).

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

2621616 is a wasteful number, since it uses less digits than its factorization.

2621616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54628 (or 54622 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 2621616 is about 1619.1405127413. The cubic root of 2621616 is about 137.8869058718.

Adding to 2621616 its reverse (6161262), we get a palindrome (8782878).

The spelling of 2621616 in words is "two million, six hundred twenty-one thousand, six hundred sixteen".