61887669 has 4 divisors (see below), whose sum is σ = 82516896. Its totient is φ = 41258444.

The previous prime is 61887659. The next prime is 61887689. The reversal of 61887669 is 96678816.

It is a happy number.

61887669 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61887669 - 2¹⁵ = 61854901 is a prime.

It is a super-2 number, since 2×61887669² = 7660167148507122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61887659) 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, 10314609 + ... + 10314614.

It is an arithmetic number, because the mean of its divisors is an integer number (20629224).

Almost surely, 2^61887669 is an apocalyptic number.

It is an amenable number.

61887669 is a deficient number, since it is larger than the sum of its proper divisors (20629227).

61887669 is a wasteful number, since it uses less digits than its factorization.

61887669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20629226.

The product of its digits is 870912, while the sum is 51.

The square root of 61887669 is about 7866.8716145619. The cubic root of 61887669 is about 395.5499874752.

The spelling of 61887669 in words is "sixty-one million, eight hundred eighty-seven thousand, six hundred sixty-nine".