78038431 has 2 divisors, whose sum is σ = 78038432. Its totient is φ = 78038430.

The previous prime is 78038423. The next prime is 78038473. The reversal of 78038431 is 13483087.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78038431 - 2³ = 78038423 is a prime.

It is a super-2 number, since 2×78038431² = 12179993425883522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78038231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39019215 + 39019216.

It is an arithmetic number, because the mean of its divisors is an integer number (39019216).

Almost surely, 2^78038431 is an apocalyptic number.

78038431 is a deficient number, since it is larger than the sum of its proper divisors (1).

78038431 is an equidigital number, since it uses as much as digits as its factorization.

78038431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 78038431 is about 8833.9363253309. The cubic root of 78038431 is about 427.3360286764.

The spelling of 78038431 in words is "seventy-eight million, thirty-eight thousand, four hundred thirty-one".