61997775 has 48 divisors (see below), whose sum is σ = 117849600. Its totient is φ = 28172160.

The previous prime is 61997711. The next prime is 61997797. The reversal of 61997775 is 57779916.

61997775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61997775 - 2⁶ = 61997711 is a prime.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 141006 + ... + 141444.

It is an arithmetic number, because the mean of its divisors is an integer number (2455200).

Almost surely, 2^61997775 is an apocalyptic number.

61997775 is a deficient number, since it is larger than the sum of its proper divisors (55851825).

61997775 is a wasteful number, since it uses less digits than its factorization.

61997775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728 (or 723 counting only the distinct ones).

The product of its digits is 833490, while the sum is 51.

The square root of 61997775 is about 7873.8665851029. The cubic root of 61997775 is about 395.7844263368.

The spelling of 61997775 in words is "sixty-one million, nine hundred ninety-seven thousand, seven hundred seventy-five".