61671664 has 20 divisors (see below), whose sum is σ = 119628256. Its totient is φ = 30799872.

The previous prime is 61671653. The next prime is 61671677. The reversal of 61671664 is 46617616.

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, 16777 + ... + 20119.

Almost surely, 2^61671664 is an apocalyptic number.

It is an amenable number.

61671664 is a deficient number, since it is larger than the sum of its proper divisors (57956592).

61671664 is a wasteful number, since it uses less digits than its factorization.

61671664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4504 (or 4498 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 61671664 is about 7853.1308406266. The cubic root of 61671664 is about 395.0892582564.

The spelling of 61671664 in words is "sixty-one million, six hundred seventy-one thousand, six hundred sixty-four".