61728629 has 2 divisors, whose sum is σ = 61728630. Its totient is φ = 61728628.

The previous prime is 61728613. The next prime is 61728631. The reversal of 61728629 is 92682716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32547025 + 29181604 = 5705^2 + 5402^2 .

It is a cyclic number.

It is not a de Polignac number, because 61728629 - 2⁴ = 61728613 is a prime.

It is a Sophie Germain prime.

Together with 61728631, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61728679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30864314 + 30864315.

It is an arithmetic number, because the mean of its divisors is an integer number (30864315).

Almost surely, 2^61728629 is an apocalyptic number.

It is an amenable number.

61728629 is a deficient number, since it is larger than the sum of its proper divisors (1).

61728629 is an equidigital number, since it uses as much as digits as its factorization.

61728629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 61728629 is about 7856.7569009102. The cubic root of 61728629 is about 395.2108664210.

The spelling of 61728629 in words is "sixty-one million, seven hundred twenty-eight thousand, six hundred twenty-nine".