67490721 has 24 divisors (see below), whose sum is σ = 99201024. Its totient is φ = 44210880.

The previous prime is 67490713. The next prime is 67490723. The reversal of 67490721 is 12709476.

It is a happy number.

It is not a de Polignac number, because 67490721 - 2³ = 67490713 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (67490723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 156376 + ... + 156806.

It is an arithmetic number, because the mean of its divisors is an integer number (4133376).

Almost surely, 2^67490721 is an apocalyptic number.

It is an amenable number.

67490721 is a deficient number, since it is larger than the sum of its proper divisors (31710303).

67490721 is a wasteful number, since it uses less digits than its factorization.

67490721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701 (or 698 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 67490721 is about 8215.2736412124. The cubic root of 67490721 is about 407.1439845372.

The spelling of 67490721 in words is "sixty-seven million, four hundred ninety thousand, seven hundred twenty-one".