61381624 has 16 divisors (see below), whose sum is σ = 117540000. Its totient is φ = 30037632.

The previous prime is 61381613. The next prime is 61381627. The reversal of 61381624 is 42618316.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61381627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81249 + ... + 82000.

It is an arithmetic number, because the mean of its divisors is an integer number (7346250).

Almost surely, 2^61381624 is an apocalyptic number.

It is an amenable number.

61381624 is a deficient number, since it is larger than the sum of its proper divisors (56158376).

61381624 is a wasteful number, since it uses less digits than its factorization.

61381624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163302 (or 163298 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 61381624 is about 7834.6425572581. The cubic root of 61381624 is about 394.4689204205.

The spelling of 61381624 in words is "sixty-one million, three hundred eighty-one thousand, six hundred twenty-four".