61991352 has 64 divisors (see below), whose sum is σ = 173844000. Its totient is φ = 20466432.

The previous prime is 61991341. The next prime is 61991353. The reversal of 61991352 is 25319916.

61991352 is a `hidden beast` number, since 619 + 9 + 1 + 35 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61991353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22228 + ... + 24860.

Almost surely, 2^61991352 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 61991352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86922000).

61991352 is an abundant number, since it is smaller than the sum of its proper divisors (111852648).

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

61991352 is a wasteful number, since it uses less digits than its factorization.

61991352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2757 (or 2747 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 61991352 is about 7873.4587063120. The cubic root of 61991352 is about 395.7707580443.

The spelling of 61991352 in words is "sixty-one million, nine hundred ninety-one thousand, three hundred fifty-two".