78999903 has 12 divisors (see below), whose sum is σ = 116539488. Its totient is φ = 51545760.

The previous prime is 78999889. The next prime is 78999911. The reversal of 78999903 is 30999987.

It is a happy number.

It is not a de Polignac number, because 78999903 - 2¹⁰ = 78998879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78999903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78999913) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92958 + ... + 93803.

It is an arithmetic number, because the mean of its divisors is an integer number (9711624).

Almost surely, 2^78999903 is an apocalyptic number.

78999903 is a deficient number, since it is larger than the sum of its proper divisors (37539585).

78999903 is a wasteful number, since it uses less digits than its factorization.

78999903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186814 (or 186811 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 54.

The square root of 78999903 is about 8888.1889606376. The cubic root of 78999903 is about 429.0838670859.

The spelling of 78999903 in words is "seventy-eight million, nine hundred ninety-nine thousand, nine hundred three".