61965987 has 4 divisors (see below), whose sum is σ = 82621320. Its totient is φ = 41310656.

The previous prime is 61965949. The next prime is 61965991. The reversal of 61965987 is 78956916.

61965987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61965987 - 2¹¹ = 61963939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61965487) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 10327662 + ... + 10327667.

It is an arithmetic number, because the mean of its divisors is an integer number (20655330).

Almost surely, 2^61965987 is an apocalyptic number.

61965987 is a deficient number, since it is larger than the sum of its proper divisors (20655333).

61965987 is a wasteful number, since it uses less digits than its factorization.

61965987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20655332.

The product of its digits is 816480, while the sum is 51.

The square root of 61965987 is about 7871.8477500521. The cubic root of 61965987 is about 395.7167715099.

The spelling of 61965987 in words is "sixty-one million, nine hundred sixty-five thousand, nine hundred eighty-seven".