61605320 has 32 divisors (see below), whose sum is σ = 158414400. Its totient is φ = 21121728.

The previous prime is 61605319. The next prime is 61605337. The reversal of 61605320 is 2350616.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109730 + ... + 110289.

It is an arithmetic number, because the mean of its divisors is an integer number (4950450).

Almost surely, 2^61605320 is an apocalyptic number.

It is an amenable number.

61605320 is an abundant number, since it is smaller than the sum of its proper divisors (96809080).

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

61605320 is a wasteful number, since it uses less digits than its factorization.

61605320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220037 (or 220033 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 61605320 is about 7848.9056562046. The cubic root of 61605320 is about 394.9475334896.

Adding to 61605320 its reverse (2350616), we get a palindrome (63955936).

It can be divided in two parts, 61605 and 320, that multiplied together give a square (19713600 = 4440²).

The spelling of 61605320 in words is "sixty-one million, six hundred five thousand, three hundred twenty".