67920665 has 16 divisors (see below), whose sum is σ = 82572048. Its totient is φ = 53630976.

The previous prime is 67920653. The next prime is 67920673. The reversal of 67920665 is 56602976.

It can be written as a sum of positive squares in 8 ways, for example, as 811801 + 67108864 = 901^2 + 8192^2 .

It is a cyclic number.

It is not a de Polignac number, because 67920665 - 2¹⁴ = 67904281 is a prime.

It is a super-2 number, since 2×67920665² = 9226433468084450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201377 + ... + 201713.

It is an arithmetic number, because the mean of its divisors is an integer number (5160753).

Almost surely, 2^67920665 is an apocalyptic number.

It is an amenable number.

67920665 is a deficient number, since it is larger than the sum of its proper divisors (14651383).

67920665 is a wasteful number, since it uses less digits than its factorization.

67920665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 67920665 is about 8241.3994564030. The cubic root of 67920665 is about 408.0067140539.

The spelling of 67920665 in words is "sixty-seven million, nine hundred twenty thousand, six hundred sixty-five".