67642639 has 4 divisors (see below), whose sum is σ = 67695856. Its totient is φ = 67589424.

The previous prime is 67642621. The next prime is 67642649. The reversal of 67642639 is 93624676.

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

It is a cyclic number.

It is not a de Polignac number, because 67642639 - 2²³ = 59254031 is a prime.

It is a super-2 number, since 2×67642639² = 9151053221768642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 67642595 and 67642604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67642649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24654 + ... + 27259.

It is an arithmetic number, because the mean of its divisors is an integer number (16923964).

Almost surely, 2^67642639 is an apocalyptic number.

67642639 is a deficient number, since it is larger than the sum of its proper divisors (53217).

67642639 is a wasteful number, since it uses less digits than its factorization.

67642639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53216.

The product of its digits is 326592, while the sum is 43.

The square root of 67642639 is about 8224.5145145473. The cubic root of 67642639 is about 407.4492420500.

The spelling of 67642639 in words is "sixty-seven million, six hundred forty-two thousand, six hundred thirty-nine".