78742903 has 4 divisors (see below), whose sum is σ = 78771528. Its totient is φ = 78714280.

The previous prime is 78742901. The next prime is 78742927. The reversal of 78742903 is 30924787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30924787 = 79 ⋅391453.

It is a cyclic number.

It is not a de Polignac number, because 78742903 - 2¹ = 78742901 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 (78742901) 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, 9688 + ... + 15853.

It is an arithmetic number, because the mean of its divisors is an integer number (19692882).

Almost surely, 2^78742903 is an apocalyptic number.

78742903 is a deficient number, since it is larger than the sum of its proper divisors (28625).

78742903 is a wasteful number, since it uses less digits than its factorization.

78742903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28624.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 78742903 is about 8873.7197949901. The cubic root of 78742903 is about 428.6180675646.

The spelling of 78742903 in words is "seventy-eight million, seven hundred forty-two thousand, nine hundred three".