67640351 has 4 divisors (see below), whose sum is σ = 68593104. Its totient is φ = 66687600.

The previous prime is 67640347. The next prime is 67640369. The reversal of 67640351 is 15304676.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 67640351 - 2² = 67640347 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67640381) 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, 476270 + ... + 476411.

It is an arithmetic number, because the mean of its divisors is an integer number (17148276).

Almost surely, 2^67640351 is an apocalyptic number.

67640351 is a deficient number, since it is larger than the sum of its proper divisors (952753).

67640351 is an equidigital number, since it uses as much as digits as its factorization.

67640351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952752.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 67640351 is about 8224.3754170150. The cubic root of 67640351 is about 407.4446480327. Note that the first 3 decimals are identical.

The spelling of 67640351 in words is "sixty-seven million, six hundred forty thousand, three hundred fifty-one".