78210431 has 8 divisors (see below), whose sum is σ = 84295344. Its totient is φ = 72135360.

The previous prime is 78210413. The next prime is 78210437. The reversal of 78210431 is 13401287.

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

It is a cyclic number.

It is not a de Polignac number, because 78210431 - 2¹⁸ = 77948287 is a prime.

It is a super-2 number, since 2×78210431² = 12233743034411522, 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 78210431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78210437) 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, 29636 + ... + 32166.

It is an arithmetic number, because the mean of its divisors is an integer number (10536918).

Almost surely, 2^78210431 is an apocalyptic number.

78210431 is a deficient number, since it is larger than the sum of its proper divisors (6084913).

78210431 is a wasteful number, since it uses less digits than its factorization.

78210431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4921.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 78210431 is about 8843.6661515460. Note that the first 3 decimals coincide. The cubic root of 78210431 is about 427.6497538571.

The spelling of 78210431 in words is "seventy-eight million, two hundred ten thousand, four hundred thirty-one".