78587421540 has 24 divisors (see below), whose sum is σ = 220044780480. Its totient is φ = 20956645728.

The previous prime is 78587421529. The next prime is 78587421557. The reversal of 78587421540 is 4512478587.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 654895120 + ... + 654895239.

It is an arithmetic number, because the mean of its divisors is an integer number (9168532520).

Almost surely, 2^78587421540 is an apocalyptic number.

It is an amenable number.

78587421540 is an abundant number, since it is smaller than the sum of its proper divisors (141457358940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78587421540 is a wasteful number, since it uses less digits than its factorization.

78587421540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309790371 (or 1309790369 counting only the distinct ones).

The product of its (nonzero) digits is 2508800, while the sum is 51.

The spelling of 78587421540 in words is "seventy-eight billion, five hundred eighty-seven million, four hundred twenty-one thousand, five hundred forty".