78203431 has 4 divisors (see below), whose sum is σ = 78223864. Its totient is φ = 78183000.

The previous prime is 78203413. The next prime is 78203453. The reversal of 78203431 is 13430287.

78203431 = T₇₂₁₉ + T₇₂₂₀ + T₇₂₂₁.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13430287 = 13 ⋅1033099.

It is a cyclic number.

It is not a de Polignac number, because 78203431 - 2⁷ = 78203303 is a prime.

It is a super-2 number, since 2×78203431² = 12231553240343522, 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 78203431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78203831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2565 + ... + 12766.

It is an arithmetic number, because the mean of its divisors is an integer number (19555966).

Almost surely, 2^78203431 is an apocalyptic number.

78203431 is the 7221-st centered triangular number.

78203431 is a deficient number, since it is larger than the sum of its proper divisors (20433).

78203431 is a wasteful number, since it uses less digits than its factorization.

78203431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20432.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 78203431 is about 8843.2703792206. The cubic root of 78203431 is about 427.6369949554.

The spelling of 78203431 in words is "seventy-eight million, two hundred three thousand, four hundred thirty-one".