67720431 has 8 divisors (see below), whose sum is σ = 91774384. Its totient is φ = 44406720.

The previous prime is 67720403. The next prime is 67720483. The reversal of 67720431 is 13402776.

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

It is not a de Polignac number, because 67720431 - 2¹¹ = 67718383 is a prime.

It is a super-2 number, since 2×67720431² = 9172113549651522, 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 (67720531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184846 + ... + 185211.

It is an arithmetic number, because the mean of its divisors is an integer number (11471798).

Almost surely, 2^67720431 is an apocalyptic number.

67720431 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

67720431 is a deficient number, since it is larger than the sum of its proper divisors (24053953).

67720431 is a wasteful number, since it uses less digits than its factorization.

67720431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370121.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 67720431 is about 8229.2424317187. The cubic root of 67720431 is about 407.6053770410.

The spelling of 67720431 in words is "sixty-seven million, seven hundred twenty thousand, four hundred thirty-one".