78242431 has 8 divisors (see below), whose sum is σ = 79231824. Its totient is φ = 77256960.

The previous prime is 78242407. The next prime is 78242453. The reversal of 78242431 is 13424287.

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 78242431 - 2²⁵ = 44687999 is a prime.

It is a super-2 number, since 2×78242431² = 12243756017579522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78242393 and 78242402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78242831) 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, 65661 + ... + 66841.

It is an arithmetic number, because the mean of its divisors is an integer number (9903978).

Almost surely, 2^78242431 is an apocalyptic number.

78242431 is a deficient number, since it is larger than the sum of its proper divisors (989393).

78242431 is a wasteful number, since it uses less digits than its factorization.

78242431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961.

The product of its digits is 10752, while the sum is 31.

The square root of 78242431 is about 8845.4751709561. The cubic root of 78242431 is about 427.7080705717.

The spelling of 78242431 in words is "seventy-eight million, two hundred forty-two thousand, four hundred thirty-one".