78477388377487 has 32 divisors (see below), whose sum is σ = 93236712192000. Its totient is φ = 65249410343040.

The previous prime is 78477388377481. The next prime is 78477388377503.

78477388377487 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78477388377487 - 2³¹ = 78475240893839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78477388377398 and 78477388377407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78477388377481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48005314 + ... + 49613152.

It is an arithmetic number, because the mean of its divisors is an integer number (2913647256000).

Almost surely, 2^{78477388377487} is an apocalyptic number.

78477388377487 is a deficient number, since it is larger than the sum of its proper divisors (14759323814513).

78477388377487 is a wasteful number, since it uses less digits than its factorization.

78477388377487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615951.

The product of its digits is 69392203776, while the sum is 88.

The spelling of 78477388377487 in words is "seventy-eight trillion, four hundred seventy-seven billion, three hundred eighty-eight million, three hundred seventy-seven thousand, four hundred eighty-seven".