67240621 has 16 divisors (see below), whose sum is σ = 78444288. Its totient is φ = 56448000.

The previous prime is 67240609. The next prime is 67240633. The reversal of 67240621 is 12604276.

It is an interprime number because it is at equal distance from previous prime (67240609) and next prime (67240633).

It is not a de Polignac number, because 67240621 - 2¹⁵ = 67207853 is a prime.

It is a super-2 number, since 2×67240621² = 9042602224931282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 67240621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67240651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95571 + ... + 96271.

It is an arithmetic number, because the mean of its divisors is an integer number (4902768).

Almost surely, 2^67240621 is an apocalyptic number.

It is an amenable number.

67240621 is a deficient number, since it is larger than the sum of its proper divisors (11203667).

67240621 is a wasteful number, since it uses less digits than its factorization.

67240621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 67240621 is about 8200.0378657662. The cubic root of 67240621 is about 406.6404449485.

Adding to 67240621 its reverse (12604276), we get a palindrome (79844897).

The spelling of 67240621 in words is "sixty-seven million, two hundred forty thousand, six hundred twenty-one".