61667890 has 8 divisors (see below), whose sum is σ = 111002220. Its totient is φ = 24667152.

The previous prime is 61667867. The next prime is 61667909. The reversal of 61667890 is 9876616.

It can be written as a sum of positive squares in 2 ways, for example, as 61168041 + 499849 = 7821^2 + 707^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3083385 + ... + 3083404.

Almost surely, 2^61667890 is an apocalyptic number.

61667890 is a deficient number, since it is larger than the sum of its proper divisors (49334330).

61667890 is a wasteful number, since it uses less digits than its factorization.

61667890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6166796.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 61667890 is about 7852.8905506189. The cubic root of 61667890 is about 395.0811989242.

The spelling of 61667890 in words is "sixty-one million, six hundred sixty-seven thousand, eight hundred ninety".