61621326 has 48 divisors (see below), whose sum is σ = 145847520. Its totient is φ = 18688320.

The previous prime is 61621303. The next prime is 61621327. The reversal of 61621326 is 62312616.

61621326 is a `hidden beast` number, since 6 + 1 + 621 + 32 + 6 = 666.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61621326.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61621327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14760 + ... + 18468.

It is an arithmetic number, because the mean of its divisors is an integer number (3038490).

Almost surely, 2^61621326 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61621326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72923760).

61621326 is an abundant number, since it is smaller than the sum of its proper divisors (84226194).

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

61621326 is a wasteful number, since it uses less digits than its factorization.

61621326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3801 (or 3798 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 61621326 is about 7849.9252225738. The cubic root of 61621326 is about 394.9817349884.

The spelling of 61621326 in words is "sixty-one million, six hundred twenty-one thousand, three hundred twenty-six".