78094421 has 2 divisors, whose sum is σ = 78094422. Its totient is φ = 78094420.

The previous prime is 78094417. The next prime is 78094433. The reversal of 78094421 is 12449087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64625521 + 13468900 = 8039^2 + 3670^2 .

It is a cyclic number.

It is not a de Polignac number, because 78094421 - 2² = 78094417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78094721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39047210 + 39047211.

It is an arithmetic number, because the mean of its divisors is an integer number (39047211).

Almost surely, 2^78094421 is an apocalyptic number.

It is an amenable number.

78094421 is a deficient number, since it is larger than the sum of its proper divisors (1).

78094421 is an equidigital number, since it uses as much as digits as its factorization.

78094421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 78094421 is about 8837.1047860711. The cubic root of 78094421 is about 427.4382040791.

The spelling of 78094421 in words is "seventy-eight million, ninety-four thousand, four hundred twenty-one".