61432720 has 20 divisors (see below), whose sum is σ = 142831260. Its totient is φ = 24573056.

The previous prime is 61432717. The next prime is 61432729. The reversal of 61432720 is 2723416.

It can be written as a sum of positive squares in 2 ways, for example, as 27373824 + 34058896 = 5232^2 + 5836^2 .

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

It is not an unprimeable number, because it can be changed into a prime (61432729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383875 + ... + 384034.

It is an arithmetic number, because the mean of its divisors is an integer number (7141563).

Almost surely, 2^61432720 is an apocalyptic number.

It is an amenable number.

61432720 is an abundant number, since it is smaller than the sum of its proper divisors (81398540).

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

61432720 is a wasteful number, since it uses less digits than its factorization.

61432720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767922 (or 767916 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 61432720 is about 7837.9027807188. The cubic root of 61432720 is about 394.5783461871.

The spelling of 61432720 in words is "sixty-one million, four hundred thirty-two thousand, seven hundred twenty".