61530616 has 32 divisors (see below), whose sum is σ = 139609440. Its totient is φ = 24818688.

The previous prime is 61530613. The next prime is 61530653. The reversal of 61530616 is 61603516.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61530613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31365 + ... + 33268.

It is an arithmetic number, because the mean of its divisors is an integer number (4362795).

Almost surely, 2^61530616 is an apocalyptic number.

It is an amenable number.

61530616 is an abundant number, since it is smaller than the sum of its proper divisors (78078824).

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

61530616 is a wasteful number, since it uses less digits than its factorization.

61530616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64663 (or 64659 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 61530616 is about 7844.1453326669. The cubic root of 61530616 is about 394.7878281569.

Subtracting 61530616 from its reverse (61603516), we obtain a square (72900 = 270²).

The spelling of 61530616 in words is "sixty-one million, five hundred thirty thousand, six hundred sixteen".