61388505 has 24 divisors (see below), whose sum is σ = 110078280. Its totient is φ = 31610880.

The previous prime is 61388491. The next prime is 61388527. The reversal of 61388505 is 50588316.

It can be written as a sum of positive squares in 4 ways, for example, as 1108809 + 60279696 = 1053^2 + 7764^2 .

It is not a de Polignac number, because 61388505 - 2⁶ = 61388441 is a prime.

It is a super-2 number, since 2×61388505² = 7537097092270050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61388505.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22216 + ... + 24825.

It is an arithmetic number, because the mean of its divisors is an integer number (4586595).

Almost surely, 2^61388505 is an apocalyptic number.

It is an amenable number.

61388505 is a deficient number, since it is larger than the sum of its proper divisors (48689775).

61388505 is a wasteful number, since it uses less digits than its factorization.

61388505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47081 (or 47078 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 61388505 is about 7835.0816843221. The cubic root of 61388505 is about 394.4836601154.

The spelling of 61388505 in words is "sixty-one million, three hundred eighty-eight thousand, five hundred five".