78705901 has 4 divisors (see below), whose sum is σ = 80190972. Its totient is φ = 77220832.

The previous prime is 78705889. The next prime is 78705929. The reversal of 78705901 is 10950787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10950787 = 661 ⋅16567.

It can be written as a sum of positive squares in 2 ways, for example, as 67322025 + 11383876 = 8205^2 + 3374^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78705901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78703901) 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, 742456 + ... + 742561.

It is an arithmetic number, because the mean of its divisors is an integer number (20047743).

Almost surely, 2^78705901 is an apocalyptic number.

It is an amenable number.

78705901 is a deficient number, since it is larger than the sum of its proper divisors (1485071).

78705901 is a wasteful number, since it uses less digits than its factorization.

78705901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485070.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 78705901 is about 8871.6346295370. The cubic root of 78705901 is about 428.5509198810.

The spelling of 78705901 in words is "seventy-eight million, seven hundred five thousand, nine hundred one".