61668894 has 32 divisors (see below), whose sum is σ = 149250816. Its totient is φ = 16583040.

The previous prime is 61668869. The next prime is 61668907. The reversal of 61668894 is 49886616.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42472 + ... + 43899.

It is an arithmetic number, because the mean of its divisors is an integer number (4664088).

Almost surely, 2^61668894 is an apocalyptic number.

61668894 is an abundant number, since it is smaller than the sum of its proper divisors (87581922).

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

61668894 is a wasteful number, since it uses less digits than its factorization.

61668894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86400.

The product of its digits is 497664, while the sum is 48.

The square root of 61668894 is about 7852.9544758645. The cubic root of 61668894 is about 395.0833429864.

The spelling of 61668894 in words is "sixty-one million, six hundred sixty-eight thousand, eight hundred ninety-four".