61525540 has 24 divisors (see below), whose sum is σ = 129370752. Its totient is φ = 24578400.

The previous prime is 61525537. The next prime is 61525589. The reversal of 61525540 is 4552516.

61525540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 61525499 and 61525508.

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, 19557 + ... + 22483.

It is an arithmetic number, because the mean of its divisors is an integer number (5390448).

Almost surely, 2^61525540 is an apocalyptic number.

It is an amenable number.

61525540 is an abundant number, since it is smaller than the sum of its proper divisors (67845212).

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

61525540 is a wasteful number, since it uses less digits than its factorization.

61525540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3987 (or 3985 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 61525540 is about 7843.8217725800. The cubic root of 61525540 is about 394.7769717830.

The spelling of 61525540 in words is "sixty-one million, five hundred twenty-five thousand, five hundred forty".