61988329 has 8 divisors (see below), whose sum is σ = 66820040. Its totient is φ = 57165696.

The previous prime is 61988299. The next prime is 61988359. The reversal of 61988329 is 92388916.

It is an interprime number because it is at equal distance from previous prime (61988299) and next prime (61988359).

It can be written as a sum of positive squares in 4 ways, for example, as 5513104 + 56475225 = 2348^2 + 7515^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61988329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61988359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20269 + ... + 23125.

It is an arithmetic number, because the mean of its divisors is an integer number (8352505).

Almost surely, 2^61988329 is an apocalyptic number.

It is an amenable number.

61988329 is a deficient number, since it is larger than the sum of its proper divisors (4831711).

61988329 is a wasteful number, since it uses less digits than its factorization.

61988329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4539.

The product of its digits is 186624, while the sum is 46.

The square root of 61988329 is about 7873.2667298905. The cubic root of 61988329 is about 395.7643247037.

The spelling of 61988329 in words is "sixty-one million, nine hundred eighty-eight thousand, three hundred twenty-nine".