61788813 has 8 divisors (see below), whose sum is σ = 82690176. Its totient is φ = 41040000.

The previous prime is 61788799. The next prime is 61788827. The reversal of 61788813 is 31888716.

It is an interprime number because it is at equal distance from previous prime (61788799) and next prime (61788827).

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

It is not a de Polignac number, because 61788813 - 2¹⁸ = 61526669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61788313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37188 + ... + 38813.

It is an arithmetic number, because the mean of its divisors is an integer number (10336272).

Almost surely, 2^61788813 is an apocalyptic number.

It is an amenable number.

61788813 is a deficient number, since it is larger than the sum of its proper divisors (20901363).

61788813 is a wasteful number, since it uses less digits than its factorization.

61788813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76275.

The product of its digits is 64512, while the sum is 42.

The square root of 61788813 is about 7860.5860468543. The cubic root of 61788813 is about 395.3392652169.

The spelling of 61788813 in words is "sixty-one million, seven hundred eighty-eight thousand, eight hundred thirteen".