61277887 has 4 divisors (see below), whose sum is σ = 66848616. Its totient is φ = 55707160.

The previous prime is 61277873. The next prime is 61277891. The reversal of 61277887 is 78877216.

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 61277887 - 2²³ = 52889279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61277897) 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, 2785348 + ... + 2785369.

It is an arithmetic number, because the mean of its divisors is an integer number (16712154).

Almost surely, 2^61277887 is an apocalyptic number.

61277887 is a deficient number, since it is larger than the sum of its proper divisors (5570729).

61277887 is a wasteful number, since it uses less digits than its factorization.

61277887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5570728.

The product of its digits is 263424, while the sum is 46.

The square root of 61277887 is about 7828.0193535785. The cubic root of 61277887 is about 394.2465732205.

The spelling of 61277887 in words is "sixty-one million, two hundred seventy-seven thousand, eight hundred eighty-seven".