67638945 has 16 divisors (see below), whose sum is σ = 118060992. Its totient is φ = 32794560.

The previous prime is 67638911. The next prime is 67638959. The reversal of 67638945 is 54983676.

It is not a de Polignac number, because 67638945 - 2⁶ = 67638881 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 67638894 and 67638903.

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, 204802 + ... + 205131.

It is an arithmetic number, because the mean of its divisors is an integer number (7378812).

Almost surely, 2^67638945 is an apocalyptic number.

It is an amenable number.

67638945 is a deficient number, since it is larger than the sum of its proper divisors (50422047).

67638945 is a wasteful number, since it uses less digits than its factorization.

67638945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409952.

The product of its digits is 1088640, while the sum is 48.

The square root of 67638945 is about 8224.2899389552. The cubic root of 67638945 is about 407.4418249094.

It can be divided in two parts, 676 and 38945, that added together give a triangular number (39621 = T₂₈₁).

The spelling of 67638945 in words is "sixty-seven million, six hundred thirty-eight thousand, nine hundred forty-five".