61821700 has 36 divisors (see below), whose sum is σ = 139991040. Its totient is φ = 23652640.

The previous prime is 61821679. The next prime is 61821701. The reversal of 61821700 is 712816.

61821700 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (61821701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11140 + ... + 15739.

It is an arithmetic number, because the mean of its divisors is an integer number (3888640).

Almost surely, 2^61821700 is an apocalyptic number.

It is an amenable number.

61821700 is an abundant number, since it is smaller than the sum of its proper divisors (78169340).

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

61821700 is a wasteful number, since it uses less digits than its factorization.

61821700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26916 (or 26909 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 61821700 is about 7862.6776609499. The cubic root of 61821700 is about 395.4093923472.

The spelling of 61821700 in words is "sixty-one million, eight hundred twenty-one thousand, seven hundred".