78742501 has 4 divisors (see below), whose sum is σ = 82166112. Its totient is φ = 75318892.

The previous prime is 78742493. The next prime is 78742519. The reversal of 78742501 is 10524787.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 78742501 - 2³ = 78742493 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 (78742541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1711771 + ... + 1711816.

It is an arithmetic number, because the mean of its divisors is an integer number (20541528).

Almost surely, 2^78742501 is an apocalyptic number.

It is an amenable number.

78742501 is a deficient number, since it is larger than the sum of its proper divisors (3423611).

78742501 is a wasteful number, since it uses less digits than its factorization.

78742501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3423610.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 78742501 is about 8873.6971438065. The cubic root of 78742501 is about 428.6173381665.

The spelling of 78742501 in words is "seventy-eight million, seven hundred forty-two thousand, five hundred one".