67649491 has 8 divisors (see below), whose sum is σ = 83261024. Its totient is φ = 53524800.

The previous prime is 67649479. The next prime is 67649501. The reversal of 67649491 is 19494676.

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

It is not a de Polignac number, because 67649491 - 2¹¹ = 67647443 is a prime.

It is a super-3 number, since 3×67649491³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (67649411) 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, 371610 + ... + 371791.

It is an arithmetic number, because the mean of its divisors is an integer number (10407628).

Almost surely, 2^67649491 is an apocalyptic number.

67649491 is a deficient number, since it is larger than the sum of its proper divisors (15611533).

67649491 is a wasteful number, since it uses less digits than its factorization.

67649491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743421.

The product of its digits is 326592, while the sum is 46.

The square root of 67649491 is about 8224.9310635409. The cubic root of 67649491 is about 407.4629993880.

The spelling of 67649491 in words is "sixty-seven million, six hundred forty-nine thousand, four hundred ninety-one".