61615320 has 128 divisors (see below), whose sum is σ = 201277440. Its totient is φ = 14999040.

The previous prime is 61615313. The next prime is 61615331. The reversal of 61615320 is 2351616.

61615320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 197965 + ... + 198275.

It is an arithmetic number, because the mean of its divisors is an integer number (1572480).

Almost surely, 2^61615320 is an apocalyptic number.

61615320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61615320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100638720).

61615320 is an abundant number, since it is smaller than the sum of its proper divisors (139662120).

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

61615320 is a wasteful number, since it uses less digits than its factorization.

61615320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 61615320 is about 7849.5426618371. The cubic root of 61615320 is about 394.9689021077.

Adding to 61615320 its reverse (2351616), we get a palindrome (63966936).

The spelling of 61615320 in words is "sixty-one million, six hundred fifteen thousand, three hundred twenty".