78311403 has 6 divisors (see below), whose sum is σ = 113116484. Its totient is φ = 52207596.

The previous prime is 78311399. The next prime is 78311411. The reversal of 78311403 is 30411387.

It is not a de Polignac number, because 78311403 - 2² = 78311399 is a prime.

It is a super-2 number, since 2×78311403² = 12265351679656818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78311423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4350625 + ... + 4350642.

Almost surely, 2^78311403 is an apocalyptic number.

78311403 is a deficient number, since it is larger than the sum of its proper divisors (34805081).

78311403 is a wasteful number, since it uses less digits than its factorization.

78311403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8701273 (or 8701270 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 78311403 is about 8849.3730286388. The cubic root of 78311403 is about 427.8337109124.

The spelling of 78311403 in words is "seventy-eight million, three hundred eleven thousand, four hundred three".