61493720 has 32 divisors (see below), whose sum is σ = 144378720. Its totient is φ = 23527680.

The previous prime is 61493713. The next prime is 61493771. The reversal of 61493720 is 2739416.

61493720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 32501 + ... + 34340.

It is an arithmetic number, because the mean of its divisors is an integer number (4511835).

Almost surely, 2^61493720 is an apocalyptic number.

It is an amenable number.

61493720 is an abundant number, since it is smaller than the sum of its proper divisors (82885000).

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

61493720 is a wasteful number, since it uses less digits than its factorization.

61493720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66875 (or 66871 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 61493720 is about 7841.7931622812. The cubic root of 61493720 is about 394.7089026556.

The spelling of 61493720 in words is "sixty-one million, four hundred ninety-three thousand, seven hundred twenty".