78248638405 has 16 divisors (see below), whose sum is σ = 110212755840. Its totient is φ = 52206040512.

The previous prime is 78248638393. The next prime is 78248638439. The reversal of 78248638405 is 50483684287.

It is a cyclic number.

It is not a de Polignac number, because 78248638405 - 2²³ = 78240249797 is a prime.

It is a super-2 number, since 2×78248638405² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30210535 + ... + 30213124.

It is an arithmetic number, because the mean of its divisors is an integer number (6888297240).

Almost surely, 2^78248638405 is an apocalyptic number.

It is an amenable number.

78248638405 is a deficient number, since it is larger than the sum of its proper divisors (31964117435).

78248638405 is a wasteful number, since it uses less digits than its factorization.

78248638405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60423708.

The product of its (nonzero) digits is 10321920, while the sum is 55.

The spelling of 78248638405 in words is "seventy-eight billion, two hundred forty-eight million, six hundred thirty-eight thousand, four hundred five".