78278401465 has 8 divisors (see below), whose sum is σ = 102473543808. Its totient is φ = 56929746480.

The previous prime is 78278401379. The next prime is 78278401469. The reversal of 78278401465 is 56410487287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78278401465 - 2¹¹ = 78278399417 is a prime.

It is a super-2 number, since 2×78278401465² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78278401469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 711621777 + ... + 711621886.

It is an arithmetic number, because the mean of its divisors is an integer number (12809192976).

Almost surely, 2^78278401465 is an apocalyptic number.

It is an amenable number.

78278401465 is a deficient number, since it is larger than the sum of its proper divisors (24195142343).

78278401465 is a wasteful number, since it uses less digits than its factorization.

78278401465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423243679.

The product of its (nonzero) digits is 3010560, while the sum is 52.

The spelling of 78278401465 in words is "seventy-eight billion, two hundred seventy-eight million, four hundred one thousand, four hundred sixty-five".