67651645 has 4 divisors (see below), whose sum is σ = 81181980. Its totient is φ = 54121312.

The previous prime is 67651621. The next prime is 67651657. The reversal of 67651645 is 54615676.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52620516 + 15031129 = 7254^2 + 3877^2 .

It is a cyclic number.

It is not a de Polignac number, because 67651645 - 2²⁵ = 34097213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 67651598 and 67651607.

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, 6765160 + ... + 6765169.

It is an arithmetic number, because the mean of its divisors is an integer number (20295495).

Almost surely, 2^67651645 is an apocalyptic number.

It is an amenable number.

67651645 is a deficient number, since it is larger than the sum of its proper divisors (13530335).

67651645 is a wasteful number, since it uses less digits than its factorization.

67651645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13530334.

The product of its digits is 151200, while the sum is 40.

The square root of 67651645 is about 8225.0620058453. The cubic root of 67651645 is about 407.4673239635.

The spelling of 67651645 in words is "sixty-seven million, six hundred fifty-one thousand, six hundred forty-five".