78504901 has 4 divisors (see below), whose sum is σ = 78581932. Its totient is φ = 78427872.

The previous prime is 78504859. The next prime is 78504919. The reversal of 78504901 is 10940587.

It is a happy number.

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 59136100 + 19368801 = 7690^2 + 4401^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78504901 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 (78504931) 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, 36966 + ... + 39031.

It is an arithmetic number, because the mean of its divisors is an integer number (19645483).

Almost surely, 2^78504901 is an apocalyptic number.

It is an amenable number.

78504901 is a deficient number, since it is larger than the sum of its proper divisors (77031).

78504901 is a wasteful number, since it uses less digits than its factorization.

78504901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77030.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 78504901 is about 8860.2991484487. The cubic root of 78504901 is about 428.1857961933.

The spelling of 78504901 in words is "seventy-eight million, five hundred four thousand, nine hundred one".