78028471 has 2 divisors, whose sum is σ = 78028472. Its totient is φ = 78028470.

The previous prime is 78028463. The next prime is 78028493. The reversal of 78028471 is 17482087.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78028471 - 2³ = 78028463 is a prime.

It is a super-3 number, since 3×78028471³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78028471.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78028441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39014235 + 39014236.

It is an arithmetic number, because the mean of its divisors is an integer number (39014236).

Almost surely, 2^78028471 is an apocalyptic number.

78028471 is a deficient number, since it is larger than the sum of its proper divisors (1).

78028471 is an equidigital number, since it uses as much as digits as its factorization.

78028471 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 78028471 is about 8833.3725722399. The cubic root of 78028471 is about 427.3178476858.

The spelling of 78028471 in words is "seventy-eight million, twenty-eight thousand, four hundred seventy-one".