67891945 has 16 divisors (see below), whose sum is σ = 89433792. Its totient is φ = 49066560.

The previous prime is 67891933. The next prime is 67891951. The reversal of 67891945 is 54919876.

It is not a de Polignac number, because 67891945 - 2¹⁷ = 67760873 is a prime.

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, 5179 + ... + 12751.

It is an arithmetic number, because the mean of its divisors is an integer number (5589612).

Almost surely, 2^67891945 is an apocalyptic number.

It is an amenable number.

67891945 is a deficient number, since it is larger than the sum of its proper divisors (21541847).

67891945 is a wasteful number, since it uses less digits than its factorization.

67891945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7752.

The product of its digits is 544320, while the sum is 49.

The square root of 67891945 is about 8239.6568496510. The cubic root of 67891945 is about 407.9491979070.

The spelling of 67891945 in words is "sixty-seven million, eight hundred ninety-one thousand, nine hundred forty-five".