61769988 has 162 divisors, whose sum is σ = 193672206. Its totient is φ = 16547328.

The previous prime is 61769957. The next prime is 61769999. The reversal of 61769988 is 88996716.

It can be written as a sum of positive squares in only one way, i.e., 51581124 + 10188864 = 7182^2 + 3192^2 .

Its product of digits (1306368) is a multiple of the sum of its prime divisors (128).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 636756 + ... + 636852.

Almost surely, 2^61769988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61769988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96836103).

61769988 is an abundant number, since it is smaller than the sum of its proper divisors (131902218).

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

61769988 is a wasteful number, since it uses less digits than its factorization.

61769988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 128 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 61769988 is about 7859.3885258333. The cubic root of 61769988 is about 395.2991122224.

The spelling of 61769988 in words is "sixty-one million, seven hundred sixty-nine thousand, nine hundred eighty-eight".