67571397 has 6 divisors (see below), whose sum is σ = 97603142. Its totient is φ = 45047592.

The previous prime is 67571377. The next prime is 67571417. The reversal of 67571397 is 79317576.

It is an interprime number because it is at equal distance from previous prime (67571377) and next prime (67571417).

It can be written as a sum of positive squares in only one way, i.e., 66487716 + 1083681 = 8154^2 + 1041^2 .

It is not a de Polignac number, because 67571397 - 2⁷ = 67571269 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 (67571327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3753958 + ... + 3753975.

Almost surely, 2^67571397 is an apocalyptic number.

It is an amenable number.

67571397 is a deficient number, since it is larger than the sum of its proper divisors (30031745).

67571397 is a wasteful number, since it uses less digits than its factorization.

67571397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7507939 (or 7507936 counting only the distinct ones).

The product of its digits is 277830, while the sum is 45.

The square root of 67571397 is about 8220.1822972486. The cubic root of 67571397 is about 407.3061484038.

The spelling of 67571397 in words is "sixty-seven million, five hundred seventy-one thousand, three hundred ninety-seven".