78305031 has 12 divisors (see below), whose sum is σ = 129265552. Its totient is φ = 44745696.

The previous prime is 78305027. The next prime is 78305053. The reversal of 78305031 is 13050387.

It is not a de Polignac number, because 78305031 - 2² = 78305027 is a prime.

It is a super-2 number, since 2×78305031² = 12263355759821922, 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 = 78304986 and 78305004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78305011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 621406 + ... + 621531.

Almost surely, 2^78305031 is an apocalyptic number.

78305031 is a deficient number, since it is larger than the sum of its proper divisors (50960521).

78305031 is a wasteful number, since it uses less digits than its factorization.

78305031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242950 (or 1242947 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 78305031 is about 8849.0129958092. The cubic root of 78305031 is about 427.8221066835.

It can be divided in two parts, 7 and 8305031, that added together give a palindrome (8305038).

The spelling of 78305031 in words is "seventy-eight million, three hundred five thousand, thirty-one".