78242447493 has 12 divisors (see below), whose sum is σ = 129162135648. Its totient is φ = 44709969960.

The previous prime is 78242447461. The next prime is 78242447509. The reversal of 78242447493 is 39474424287.

78242447493 is a `hidden beast` number, since 7 + 82 + 4 + 2 + 4 + 474 + 93 = 666.

It is not a de Polignac number, because 78242447493 - 2⁵ = 78242447461 is a prime.

It is a super-2 number, since 2×78242447493² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78242447893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 620971743 + ... + 620971868.

It is an arithmetic number, because the mean of its divisors is an integer number (10763511304).

Almost surely, 2^78242447493 is an apocalyptic number.

It is an amenable number.

78242447493 is a deficient number, since it is larger than the sum of its proper divisors (50919688155).

78242447493 is a wasteful number, since it uses less digits than its factorization.

78242447493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241943624 (or 1241943621 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 54.

The spelling of 78242447493 in words is "seventy-eight billion, two hundred forty-two million, four hundred forty-seven thousand, four hundred ninety-three".