78287482981 has 4 divisors (see below), whose sum is σ = 78432192364. Its totient is φ = 78142773600.

The previous prime is 78287482957. The next prime is 78287482997. The reversal of 78287482981 is 18928478287.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14129125956 + 64158357025 = 118866^2 + 253295^2 .

It is a cyclic number.

It is not a de Polignac number, because 78287482981 - 2⁷ = 78287482853 is a prime.

It is a super-2 number, since 2×78287482981² (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 (78287482921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72353880 + ... + 72354961.

It is an arithmetic number, because the mean of its divisors is an integer number (19608048091).

Almost surely, 2^78287482981 is an apocalyptic number.

It is an amenable number.

78287482981 is a deficient number, since it is larger than the sum of its proper divisors (144709383).

78287482981 is a wasteful number, since it uses less digits than its factorization.

78287482981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144709382.

The product of its digits is 28901376, while the sum is 64.

The spelling of 78287482981 in words is "seventy-eight billion, two hundred eighty-seven million, four hundred eighty-two thousand, nine hundred eighty-one".