61520644 has 6 divisors (see below), whose sum is σ = 107661134. Its totient is φ = 30760320.

The previous prime is 61520611. The next prime is 61520663. The reversal of 61520644 is 44602516.

61520644 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 only one way, i.e., 43560000 + 17960644 = 6600^2 + 4238^2 .

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 as a sum of consecutive naturals, namely, 7690077 + ... + 7690084.

Almost surely, 2^61520644 is an apocalyptic number.

It is an amenable number.

61520644 is a deficient number, since it is larger than the sum of its proper divisors (46140490).

61520644 is a wasteful number, since it uses less digits than its factorization.

61520644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15380165 (or 15380163 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 61520644 is about 7843.5096736091. The cubic root of 61520644 is about 394.7664998211.

The spelling of 61520644 in words is "sixty-one million, five hundred twenty thousand, six hundred forty-four".