78019465 has 4 divisors (see below), whose sum is σ = 93623364. Its totient is φ = 62415568.

The previous prime is 78019457. The next prime is 78019471. The reversal of 78019465 is 56491087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56491087 = 379 ⋅149053.

It can be written as a sum of positive squares in 2 ways, for example, as 58491904 + 19527561 = 7648^2 + 4419^2 .

It is a cyclic number.

It is not a de Polignac number, because 78019465 - 2³ = 78019457 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7801942 + ... + 7801951.

It is an arithmetic number, because the mean of its divisors is an integer number (23405841).

Almost surely, 2^78019465 is an apocalyptic number.

It is an amenable number.

78019465 is a deficient number, since it is larger than the sum of its proper divisors (15603899).

78019465 is a wasteful number, since it uses less digits than its factorization.

78019465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15603898.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 78019465 is about 8832.8627862092. The cubic root of 78019465 is about 427.3014067954.

The spelling of 78019465 in words is "seventy-eight million, nineteen thousand, four hundred sixty-five".