61769664 has 84 divisors (see below), whose sum is σ = 193167000. Its totient is φ = 18716160.

The previous prime is 61769647. The next prime is 61769671. The reversal of 61769664 is 46696716.

It is a happy number.

61769664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11 ways as a sum of consecutive naturals, for example, 1462 + ... + 11210.

Almost surely, 2^61769664 is an apocalyptic number.

61769664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61769664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96583500).

61769664 is an abundant number, since it is smaller than the sum of its proper divisors (131397336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61769664 is a wasteful number, since it uses less digits than its factorization.

61769664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9778 (or 9765 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 61769664 is about 7859.3679135157. The cubic root of 61769664 is about 395.2984210716.

The spelling of 61769664 in words is "sixty-one million, seven hundred sixty-nine thousand, six hundred sixty-four".