61669408 has 24 divisors (see below), whose sum is σ = 121706172. Its totient is φ = 30759936.

The previous prime is 61669397. The next prime is 61669427. The reversal of 61669408 is 80496616.

It can be written as a sum of positive squares in 2 ways, for example, as 51093904 + 10575504 = 7148^2 + 3252^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 12516 + ... + 16732.

Almost surely, 2^61669408 is an apocalyptic number.

It is an amenable number.

61669408 is a deficient number, since it is larger than the sum of its proper divisors (60036764).

61669408 is a wasteful number, since it uses less digits than its factorization.

61669408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4684 (or 4676 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 61669408 is about 7852.9872023326. The cubic root of 61669408 is about 395.0844406347.

The spelling of 61669408 in words is "sixty-one million, six hundred sixty-nine thousand, four hundred eight".