65621622 has 64 divisors (see below), whose sum is σ = 150958080. Its totient is φ = 18823200.

The previous prime is 65621617. The next prime is 65621627. The reversal of 65621622 is 22612656.

It is an interprime number because it is at equal distance from previous prime (65621617) and next prime (65621627).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 65621622.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65621627) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210847 + ... + 211157.

It is an arithmetic number, because the mean of its divisors is an integer number (2358720).

Almost surely, 2^65621622 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65621622, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75479040).

65621622 is an abundant number, since it is smaller than the sum of its proper divisors (85336458).

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

65621622 is a wasteful number, since it uses less digits than its factorization.

65621622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489.

The product of its digits is 8640, while the sum is 30.

The square root of 65621622 is about 8100.7173756403. The cubic root of 65621622 is about 403.3502405468.

The spelling of 65621622 in words is "sixty-five million, six hundred twenty-one thousand, six hundred twenty-two".