78090501 has 4 divisors (see below), whose sum is σ = 104120672. Its totient is φ = 52060332.

The previous prime is 78090499. The next prime is 78090521. The reversal of 78090501 is 10509087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10509087 = 3 ⋅3503029.

It is not a de Polignac number, because 78090501 - 2¹ = 78090499 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 (78090521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13015081 + ... + 13015086.

It is an arithmetic number, because the mean of its divisors is an integer number (26030168).

Almost surely, 2^78090501 is an apocalyptic number.

It is an amenable number.

78090501 is a deficient number, since it is larger than the sum of its proper divisors (26030171).

78090501 is a wasteful number, since it uses less digits than its factorization.

78090501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26030170.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 78090501 is about 8836.8829911910. The cubic root of 78090501 is about 427.4310521137.

Adding to 78090501 its reverse (10509087), we get a palindrome (88599588).

The spelling of 78090501 in words is "seventy-eight million, ninety thousand, five hundred one".