67402721 has 8 divisors (see below), whose sum is σ = 69417600. Its totient is φ = 65417040.

The previous prime is 67402717. The next prime is 67402733. The reversal of 67402721 is 12720476.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 67402721 - 2² = 67402717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67402781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2570 + ... + 11891.

It is an arithmetic number, because the mean of its divisors is an integer number (8677200).

Almost surely, 2^67402721 is an apocalyptic number.

It is an amenable number.

67402721 is a deficient number, since it is larger than the sum of its proper divisors (2014879).

67402721 is a wasteful number, since it uses less digits than its factorization.

67402721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14599.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 67402721 is about 8209.9160166228. The cubic root of 67402721 is about 406.9669515390.

The spelling of 67402721 in words is "sixty-seven million, four hundred two thousand, seven hundred twenty-one".