61569648 has 120 divisors (see below), whose sum is σ = 208567008. Its totient is φ = 16551936.

The previous prime is 61569637. The next prime is 61569661. The reversal of 61569648 is 84696516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15340 + ... + 18932.

Almost surely, 2^61569648 is an apocalyptic number.

61569648 is a gapful number since it is divisible by the number (68) 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 61569648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104283504).

61569648 is an abundant number, since it is smaller than the sum of its proper divisors (146997360).

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

61569648 is a wasteful number, since it uses less digits than its factorization.

61569648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3631 (or 3622 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 61569648 is about 7846.6329084519. The cubic root of 61569648 is about 394.8712885129.

The spelling of 61569648 in words is "sixty-one million, five hundred sixty-nine thousand, six hundred forty-eight".