67781745 has 16 divisors (see below), whose sum is σ = 120501120. Its totient is φ = 36150192.

The previous prime is 67781731. The next prime is 67781761. The reversal of 67781745 is 54718776.

It is not a de Polignac number, because 67781745 - 2⁷ = 67781617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 67781745.

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, 250909 + ... + 251178.

It is an arithmetic number, because the mean of its divisors is an integer number (7531320).

Almost surely, 2^67781745 is an apocalyptic number.

It is an amenable number.

67781745 is a deficient number, since it is larger than the sum of its proper divisors (52719375).

67781745 is a wasteful number, since it uses less digits than its factorization.

67781745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502101 (or 502095 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The square root of 67781745 is about 8232.9669621589. The cubic root of 67781745 is about 407.7283550796.

The spelling of 67781745 in words is "sixty-seven million, seven hundred eighty-one thousand, seven hundred forty-five".