61566320 has 20 divisors (see below), whose sum is σ = 143141880. Its totient is φ = 24626496.

The previous prime is 61566319. The next prime is 61566343. The reversal of 61566320 is 2366516.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384710 + ... + 384869.

It is an arithmetic number, because the mean of its divisors is an integer number (7157094).

Almost surely, 2^61566320 is an apocalyptic number.

It is an amenable number.

61566320 is an abundant number, since it is smaller than the sum of its proper divisors (81575560).

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

61566320 is a wasteful number, since it uses less digits than its factorization.

61566320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769592 (or 769586 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 61566320 is about 7846.4208401028. The cubic root of 61566320 is about 394.8641737771.

The spelling of 61566320 in words is "sixty-one million, five hundred sixty-six thousand, three hundred twenty".