78743440077 has 8 divisors (see below), whose sum is σ = 110517108960. Its totient is φ = 49732698960.

The previous prime is 78743440063. The next prime is 78743440103. The reversal of 78743440077 is 77004434787.

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

It is not a de Polignac number, because 78743440077 - 2⁷ = 78743439949 is a prime.

It is a super-4 number, since 4×78743440077⁴ (a number of 45 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78743440177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690731874 + ... + 690731987.

It is an arithmetic number, because the mean of its divisors is an integer number (13814638620).

Almost surely, 2^78743440077 is an apocalyptic number.

It is an amenable number.

78743440077 is a deficient number, since it is larger than the sum of its proper divisors (31773668883).

78743440077 is a wasteful number, since it uses less digits than its factorization.

78743440077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381463883.

The product of its (nonzero) digits is 3687936, while the sum is 51.

The spelling of 78743440077 in words is "seventy-eight billion, seven hundred forty-three million, four hundred forty thousand, seventy-seven".