61997216 has 24 divisors (see below), whose sum is σ = 122440500. Its totient is φ = 30901248.

The previous prime is 61997189. The next prime is 61997219. The reversal of 61997216 is 61279916.

It can be written as a sum of positive squares in 2 ways, for example, as 50410000 + 11587216 = 7100^2 + 3404^2 .

It is not an unprimeable number, because it can be changed into a prime (61997219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7910 + ... + 13658.

Almost surely, 2^61997216 is an apocalyptic number.

It is an amenable number.

61997216 is a deficient number, since it is larger than the sum of its proper divisors (60443284).

61997216 is a wasteful number, since it uses less digits than its factorization.

61997216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6096 (or 6088 counting only the distinct ones).

The product of its digits is 40824, while the sum is 41.

The square root of 61997216 is about 7873.8310878504. The cubic root of 61997216 is about 395.7832368093.

The spelling of 61997216 in words is "sixty-one million, nine hundred ninety-seven thousand, two hundred sixteen".