78552431 has 4 divisors (see below), whose sum is σ = 78771600. Its totient is φ = 78333264.

The previous prime is 78552407. The next prime is 78552437. The reversal of 78552431 is 13425587.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78552431 - 2⁶ = 78552367 is a prime.

It is a super-2 number, since 2×78552431² = 12340968832019522, 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 = 78552391 and 78552400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78552437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109046 + ... + 109763.

It is an arithmetic number, because the mean of its divisors is an integer number (19692900).

Almost surely, 2^78552431 is an apocalyptic number.

78552431 is a deficient number, since it is larger than the sum of its proper divisors (219169).

78552431 is a wasteful number, since it uses less digits than its factorization.

78552431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219168.

The product of its digits is 33600, while the sum is 35.

The square root of 78552431 is about 8862.9809319438. The cubic root of 78552431 is about 428.2721923494.

The spelling of 78552431 in words is "seventy-eight million, five hundred fifty-two thousand, four hundred thirty-one".