2621220 has 72 divisors (see below), whose sum is σ = 8495424. Its totient is φ = 591552.

The previous prime is 2621219. The next prime is 2621239. The reversal of 2621220 is 221262.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a zygodrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 2621220.

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, 33141 + ... + 33219.

It is an arithmetic number, because the mean of its divisors is an integer number (117992).

2^2621220 is an apocalyptic number.

2621220 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 2621220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4247712).

2621220 is an abundant number, since it is smaller than the sum of its proper divisors (5874204).

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

2621220 is a wasteful number, since it uses less digits than its factorization.

2621220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 2621220 is about 1619.0182210216. The cubic root of 2621220 is about 137.8799628306.

Adding to 2621220 its reverse (221262), we get a palindrome (2842482).

The spelling of 2621220 in words is "two million, six hundred twenty-one thousand, two hundred twenty".