78133231 has 8 divisors (see below), whose sum is σ = 88942464. Its totient is φ = 67941720.

The previous prime is 78133229. The next prime is 78133243. The reversal of 78133231 is 13233187.

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

It is not a de Polignac number, because 78133231 - 2¹ = 78133229 is a prime.

It is a super-2 number, since 2×78133231² = 12209603572998722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78133231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78133261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154161 + ... + 154666.

It is an arithmetic number, because the mean of its divisors is an integer number (11117808).

Almost surely, 2^78133231 is an apocalyptic number.

78133231 is a deficient number, since it is larger than the sum of its proper divisors (10809233).

78133231 is a wasteful number, since it uses less digits than its factorization.

78133231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308861.

The product of its digits is 3024, while the sum is 28.

The square root of 78133231 is about 8839.3003682418. The cubic root of 78133231 is about 427.5089992748.

The spelling of 78133231 in words is "seventy-eight million, one hundred thirty-three thousand, two hundred thirty-one".