78473928781 has 8 divisors (see below), whose sum is σ = 81894783744. Its totient is φ = 75053819280.

The previous prime is 78473928749. The next prime is 78473928817. The reversal of 78473928781 is 18782937487.

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

It is a cyclic number.

It is not a de Polignac number, because 78473928781 - 2⁵ = 78473928749 is a prime.

It is a super-2 number, since 2×78473928781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78474928781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34335 + ... + 397651.

It is an arithmetic number, because the mean of its divisors is an integer number (10236847968).

Almost surely, 2^78473928781 is an apocalyptic number.

It is an amenable number.

78473928781 is a deficient number, since it is larger than the sum of its proper divisors (3420854963).

78473928781 is a wasteful number, since it uses less digits than its factorization.

78473928781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372731.

The product of its digits is 37933056, while the sum is 64.

The spelling of 78473928781 in words is "seventy-eight billion, four hundred seventy-three million, nine hundred twenty-eight thousand, seven hundred eighty-one".