78066403 has 4 divisors (see below), whose sum is σ = 79539408. Its totient is φ = 76593400.

The previous prime is 78066379. The next prime is 78066449. The reversal of 78066403 is 30466087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30466087 = 31 ⋅982777.

It is a cyclic number.

It is not a de Polignac number, because 78066403 - 2¹⁷ = 77935331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78066493) 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, 736423 + ... + 736528.

It is an arithmetic number, because the mean of its divisors is an integer number (19884852).

Almost surely, 2^78066403 is an apocalyptic number.

78066403 is a deficient number, since it is larger than the sum of its proper divisors (1473005).

78066403 is a wasteful number, since it uses less digits than its factorization.

78066403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473004.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 78066403 is about 8835.5193961646. The cubic root of 78066403 is about 427.3870805121.

The spelling of 78066403 in words is "seventy-eight million, sixty-six thousand, four hundred three".