78919401 has 16 divisors (see below), whose sum is σ = 114948288. Its totient is φ = 47764800.

The previous prime is 78919387. The next prime is 78919429. The reversal of 78919401 is 10491987.

It is a happy number.

It is not a de Polignac number, because 78919401 - 2¹⁰ = 78918377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78919401.

It is not an unprimeable number, because it can be changed into a prime (78919441) 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, 35791 + ... + 37931.

It is an arithmetic number, because the mean of its divisors is an integer number (7184268).

Almost surely, 2^78919401 is an apocalyptic number.

It is an amenable number.

78919401 is a deficient number, since it is larger than the sum of its proper divisors (36028887).

78919401 is a wasteful number, since it uses less digits than its factorization.

78919401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3272.

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

The square root of 78919401 is about 8883.6592122841. The cubic root of 78919401 is about 428.9380700753.

The spelling of 78919401 in words is "seventy-eight million, nine hundred nineteen thousand, four hundred one".