61500740 has 48 divisors (see below), whose sum is σ = 148237824. Its totient is φ = 20995200.

The previous prime is 61500737. The next prime is 61500757. The reversal of 61500740 is 4700516.

61500740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 15 ways as a sum of consecutive naturals, for example, 37130 + ... + 38750.

It is an arithmetic number, because the mean of its divisors is an integer number (3088288).

Almost surely, 2^61500740 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 61500740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74118912).

61500740 is an abundant number, since it is smaller than the sum of its proper divisors (86737084).

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

61500740 is a wasteful number, since it uses less digits than its factorization.

61500740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908 (or 1906 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 61500740 is about 7842.2407512139. The cubic root of 61500740 is about 394.7239218102.

The spelling of 61500740 in words is "sixty-one million, five hundred thousand, seven hundred forty".