78138603 has 6 divisors (see below), whose sum is σ = 112866884. Its totient is φ = 52092396.

The previous prime is 78138601. The next prime is 78138617. The reversal of 78138603 is 30683187.

It is not a de Polignac number, because 78138603 - 2¹ = 78138601 is a prime.

It is a super-2 number, since 2×78138603² = 12211282557583218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78138601) 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 5 ways as a sum of consecutive naturals, for example, 4341025 + ... + 4341042.

Almost surely, 2^78138603 is an apocalyptic number.

78138603 is a deficient number, since it is larger than the sum of its proper divisors (34728281).

78138603 is a wasteful number, since it uses less digits than its factorization.

78138603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8682073 (or 8682070 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 78138603 is about 8839.6042332222. The cubic root of 78138603 is about 427.5187967523.

The spelling of 78138603 in words is "seventy-eight million, one hundred thirty-eight thousand, six hundred three".