61868438 has 4 divisors (see below), whose sum is σ = 92802660. Its totient is φ = 30934218.

The previous prime is 61868419. The next prime is 61868461. The reversal of 61868438 is 83486816.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15467108 + ... + 15467111.

It is an arithmetic number, because the mean of its divisors is an integer number (23200665).

Almost surely, 2^61868438 is an apocalyptic number.

61868438 is a deficient number, since it is larger than the sum of its proper divisors (30934222).

61868438 is a wasteful number, since it uses less digits than its factorization.

61868438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30934221.

The product of its digits is 221184, while the sum is 44.

The square root of 61868438 is about 7865.6492421160. The cubic root of 61868438 is about 395.5090121082.

The spelling of 61868438 in words is "sixty-one million, eight hundred sixty-eight thousand, four hundred thirty-eight".