78213503 has 2 divisors, whose sum is σ = 78213504. Its totient is φ = 78213502.

The previous prime is 78213497. The next prime is 78213511. The reversal of 78213503 is 30531287.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78213503 - 2¹⁰ = 78212479 is a prime.

It is a super-2 number, since 2×78213503² = 12234704103062018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78213533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39106751 + 39106752.

It is an arithmetic number, because the mean of its divisors is an integer number (39106752).

Almost surely, 2^78213503 is an apocalyptic number.

78213503 is a deficient number, since it is larger than the sum of its proper divisors (1).

78213503 is an equidigital number, since it uses as much as digits as its factorization.

78213503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 78213503 is about 8843.8398334660. The cubic root of 78213503 is about 427.6553529518.

The spelling of 78213503 in words is "seventy-eight million, two hundred thirteen thousand, five hundred three".