67599961 has 16 divisors (see below), whose sum is σ = 79950528. Its totient is φ = 56347200.

The previous prime is 67599953. The next prime is 67599991. The reversal of 67599961 is 16999576.

67599961 = 2474² + 2475² + ... + 2484².

It is not a de Polignac number, because 67599961 - 2³ = 67599953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 67599899 and 67599908.

It is not an unprimeable number, because it can be changed into a prime (67599991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20946 + ... + 23956.

It is an arithmetic number, because the mean of its divisors is an integer number (4996908).

Almost surely, 2^67599961 is an apocalyptic number.

It is an amenable number.

67599961 is a deficient number, since it is larger than the sum of its proper divisors (12350567).

67599961 is a wasteful number, since it uses less digits than its factorization.

67599961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3192.

The product of its digits is 918540, while the sum is 52.

The square root of 67599961 is about 8221.9195447292. The cubic root of 67599961 is about 407.3635329105.

The spelling of 67599961 in words is "sixty-seven million, five hundred ninety-nine thousand, nine hundred sixty-one".