231767638 has 4 divisors (see below), whose sum is σ = 347651460. Its totient is φ = 115883818.

The previous prime is 231767617. The next prime is 231767677. The reversal of 231767638 is 836767132.

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

It is a junction number, because it is equal to n+sod(n) for n = 231767594 and 231767603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57941908 + ... + 57941911.

It is an arithmetic number, because the mean of its divisors is an integer number (86912865).

Almost surely, 2^231767638 is an apocalyptic number.

231767638 is a deficient number, since it is larger than the sum of its proper divisors (115883822).

231767638 is a wasteful number, since it uses less digits than its factorization.

231767638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115883821.

The product of its digits is 254016, while the sum is 43.

The square root of 231767638 is about 15223.9166445432. The cubic root of 231767638 is about 614.2581558988.

The spelling of 231767638 in words is "two hundred thirty-one million, seven hundred sixty-seven thousand, six hundred thirty-eight".