61988065 has 32 divisors (see below), whose sum is σ = 80216064. Its totient is φ = 45904320.

The previous prime is 61988063. The next prime is 61988077. The reversal of 61988065 is 56088916.

It is not a de Polignac number, because 61988065 - 2¹ = 61988063 is a prime.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61988063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 488032 + ... + 488158.

It is an arithmetic number, because the mean of its divisors is an integer number (2506752).

Almost surely, 2^61988065 is an apocalyptic number.

61988065 is the 3937-th decagonal number.

It is an amenable number.

61988065 is a deficient number, since it is larger than the sum of its proper divisors (18227999).

61988065 is a wasteful number, since it uses less digits than its factorization.

61988065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 61988065 is about 7873.2499642778. The cubic root of 61988065 is about 395.7637628671.

The spelling of 61988065 in words is "sixty-one million, nine hundred eighty-eight thousand, sixty-five".