67752421 has 4 divisors (see below), whose sum is σ = 73911744. Its totient is φ = 61593100.

The previous prime is 67752413. The next prime is 67752469. The reversal of 67752421 is 12425776.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67752421 - 2³ = 67752413 is a prime.

It is a super-2 number, since 2×67752421² = 9180781102722482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67752491) 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, 3079645 + ... + 3079666.

It is an arithmetic number, because the mean of its divisors is an integer number (18477936).

Almost surely, 2^67752421 is an apocalyptic number.

It is an amenable number.

67752421 is a deficient number, since it is larger than the sum of its proper divisors (6159323).

67752421 is a wasteful number, since it uses less digits than its factorization.

67752421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6159322.

The product of its digits is 23520, while the sum is 34.

The square root of 67752421 is about 8231.1858805399. The cubic root of 67752421 is about 407.6695489272.

The spelling of 67752421 in words is "sixty-seven million, seven hundred fifty-two thousand, four hundred twenty-one".