61523780 has 24 divisors (see below), whose sum is σ = 132352920. Its totient is φ = 24008960.

The previous prime is 61523771. The next prime is 61523801. The reversal of 61523780 is 8732516.

It is a happy number.

61523780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5692996 + 55830784 = 2386^2 + 7472^2 .

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, 36695 + ... + 38334.

It is an arithmetic number, because the mean of its divisors is an integer number (5514705).

Almost surely, 2^61523780 is an apocalyptic number.

It is an amenable number.

61523780 is an abundant number, since it is smaller than the sum of its proper divisors (70829140).

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

61523780 is a wasteful number, since it uses less digits than its factorization.

61523780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75079 (or 75077 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 61523780 is about 7843.7095815692. The cubic root of 61523780 is about 394.7732074162.

The spelling of 61523780 in words is "sixty-one million, five hundred twenty-three thousand, seven hundred eighty".