78019491 has 16 divisors (see below), whose sum is σ = 119456640. Its totient is φ = 44795520.

The previous prime is 78019471. The next prime is 78019499. The reversal of 78019491 is 19491087.

It is a happy number.

It is not a de Polignac number, because 78019491 - 2¹⁰ = 78018467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78019499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61590 + ... + 62843.

It is an arithmetic number, because the mean of its divisors is an integer number (7466040).

Almost surely, 2^78019491 is an apocalyptic number.

78019491 is a deficient number, since it is larger than the sum of its proper divisors (41437149).

78019491 is a wasteful number, since it uses less digits than its factorization.

78019491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124466.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 78019491 is about 8832.8642579856. The cubic root of 78019491 is about 427.3014542615.

The spelling of 78019491 in words is "seventy-eight million, nineteen thousand, four hundred ninety-one".