61640200 has 48 divisors (see below), whose sum is σ = 143919360. Its totient is φ = 24552000.

The previous prime is 61640177. The next prime is 61640203. The reversal of 61640200 is 204616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61640203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61705 + ... + 62695.

It is an arithmetic number, because the mean of its divisors is an integer number (2998320).

Almost surely, 2^61640200 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61640200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71959680).

61640200 is an abundant number, since it is smaller than the sum of its proper divisors (82279160).

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

61640200 is a wasteful number, since it uses less digits than its factorization.

61640200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318 (or 1309 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 61640200 is about 7851.1273075909. The cubic root of 61640200 is about 395.0220571991.

Adding to 61640200 its reverse (204616), we get a palindrome (61844816).

The spelling of 61640200 in words is "sixty-one million, six hundred forty thousand, two hundred".