61307532 has 72 divisors (see below), whose sum is σ = 182080080. Its totient is φ = 17147520.

The previous prime is 61307513. The next prime is 61307539. The reversal of 61307532 is 23570316.

It is a happy number.

It is a super-2 number, since 2×61307532² = 7517226959862048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61307496 and 61307505.

It is not an unprimeable number, because it can be changed into a prime (61307539) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 807 + ... + 11102.

It is an arithmetic number, because the mean of its divisors is an integer number (2528890).

Almost surely, 2^61307532 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 61307532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91040040).

61307532 is an abundant number, since it is smaller than the sum of its proper divisors (120772548).

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

61307532 is a wasteful number, since it uses less digits than its factorization.

61307532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11943 (or 11938 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 61307532 is about 7829.9126431909. The cubic root of 61307532 is about 394.3101391386.

Adding to 61307532 its reverse (23570316), we get a palindrome (84877848).

The spelling of 61307532 in words is "sixty-one million, three hundred seven thousand, five hundred thirty-two".