61965580 has 24 divisors (see below), whose sum is σ = 133155792. Its totient is φ = 24209472.

The previous prime is 61965571. The next prime is 61965581. The reversal of 61965580 is 8556916.

It is not an unprimeable number, because it can be changed into a prime (61965581) by changing a digit.

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, 35167 + ... + 36886.

It is an arithmetic number, because the mean of its divisors is an integer number (5548158).

Almost surely, 2^61965580 is an apocalyptic number.

It is an amenable number.

61965580 is an abundant number, since it is smaller than the sum of its proper divisors (71190212).

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

61965580 is a wasteful number, since it uses less digits than its factorization.

61965580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72105 (or 72103 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 61965580 is about 7871.8218983918. The cubic root of 61965580 is about 395.7159051363.

The spelling of 61965580 in words is "sixty-one million, nine hundred sixty-five thousand, five hundred eighty".