78940501 has 4 divisors (see below), whose sum is σ = 78966252. Its totient is φ = 78914752.

The previous prime is 78940493. The next prime is 78940567. The reversal of 78940501 is 10504987.

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 44542276 + 34398225 = 6674^2 + 5865^2 .

It is a cyclic number.

It is not a de Polignac number, because 78940501 - 2³ = 78940493 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 (78940591) 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, 7540 + ... + 14653.

It is an arithmetic number, because the mean of its divisors is an integer number (19741563).

Almost surely, 2^78940501 is an apocalyptic number.

It is an amenable number.

78940501 is a deficient number, since it is larger than the sum of its proper divisors (25751).

78940501 is a wasteful number, since it uses less digits than its factorization.

78940501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25750.

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

The square root of 78940501 is about 8884.8467066123. The cubic root of 78940501 is about 428.9762938272.

The spelling of 78940501 in words is "seventy-eight million, nine hundred forty thousand, five hundred one".