78428031 has 8 divisors (see below), whose sum is σ = 114077184. Its totient is φ = 47532120.

The previous prime is 78428027. The next prime is 78428083. The reversal of 78428031 is 13082487.

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

It is not a de Polignac number, because 78428031 - 2² = 78428027 is a prime.

It is a super-2 number, since 2×78428031² = 12301912093073922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 2376607 = 78428031 / (7 + 8 + 4 + 2 + 8 + 0 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 78427983 and 78428001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78427031) 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, 1188271 + ... + 1188336.

It is an arithmetic number, because the mean of its divisors is an integer number (14259648).

Almost surely, 2^78428031 is an apocalyptic number.

78428031 is a deficient number, since it is larger than the sum of its proper divisors (35649153).

78428031 is a wasteful number, since it uses less digits than its factorization.

78428031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376621.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 78428031 is about 8855.9601963875. The cubic root of 78428031 is about 428.0459943438.

The spelling of 78428031 in words is "seventy-eight million, four hundred twenty-eight thousand, thirty-one".