78780101 has 8 divisors (see below), whose sum is σ = 81066744. Its totient is φ = 76523200.

The previous prime is 78780089. The next prime is 78780113. The reversal of 78780101 is 10108787.

It is an interprime number because it is at equal distance from previous prime (78780089) and next prime (78780113).

It can be written as a sum of positive squares in 4 ways, for example, as 31528225 + 47251876 = 5615^2 + 6874^2 .

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 78780101 - 2¹⁴ = 78763717 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 (78780151) 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, 2006 + ... + 12711.

It is an arithmetic number, because the mean of its divisors is an integer number (10133343).

Almost surely, 2^78780101 is an apocalyptic number.

It is an amenable number.

78780101 is a deficient number, since it is larger than the sum of its proper divisors (2286643).

78780101 is a wasteful number, since it uses less digits than its factorization.

78780101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14871.

The product of its (nonzero) digits is 3136, while the sum is 32.

The square root of 78780101 is about 8875.8155118276. The cubic root of 78780101 is about 428.6855497305.

Adding to 78780101 its reverse (10108787), we get a palindrome (88888888).

The spelling of 78780101 in words is "seventy-eight million, seven hundred eighty thousand, one hundred one".