67920644 has 24 divisors (see below), whose sum is σ = 137295648. Its totient is φ = 29056640.

The previous prime is 67920631. The next prime is 67920653. The reversal of 67920644 is 44602976.

It is a super-2 number, since 2×67920644² = 9226427762749472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 67920598 and 67920607.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44654 + ... + 46149.

It is an arithmetic number, because the mean of its divisors is an integer number (5720652).

Almost surely, 2^67920644 is an apocalyptic number.

It is an amenable number.

67920644 is an abundant number, since it is smaller than the sum of its proper divisors (69375004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

67920644 is a wasteful number, since it uses less digits than its factorization.

67920644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90835 (or 90833 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 67920644 is about 8241.3981823475. The cubic root of 67920644 is about 408.0066720042.

The spelling of 67920644 in words is "sixty-seven million, nine hundred twenty thousand, six hundred forty-four".