61667838 has 32 divisors (see below), whose sum is σ = 138700800. Its totient is φ = 20306808.

The previous prime is 61667821. The next prime is 61667843. The reversal of 61667838 is 83876616.

It is a junction number, because it is equal to n+sod(n) for n = 61667793 and 61667802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2398 + ... + 11361.

It is an arithmetic number, because the mean of its divisors is an integer number (4334400).

Almost surely, 2^61667838 is an apocalyptic number.

61667838 is an abundant number, since it is smaller than the sum of its proper divisors (77032962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61667838 is a wasteful number, since it uses less digits than its factorization.

61667838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13853 (or 13847 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 61667838 is about 7852.8872397355. The cubic root of 61667838 is about 395.0810878765.

The spelling of 61667838 in words is "sixty-one million, six hundred sixty-seven thousand, eight hundred thirty-eight".