78213803 has 2 divisors, whose sum is σ = 78213804. Its totient is φ = 78213802.

The previous prime is 78213799. The next prime is 78213809. The reversal of 78213803 is 30831287.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78213803 - 2² = 78213799 is a prime.

It is a super-3 number, since 3×78213803³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 78213803.

It is not a weakly prime, because it can be changed into another prime (78213809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39106901 + 39106902.

It is an arithmetic number, because the mean of its divisors is an integer number (39106902).

Almost surely, 2^78213803 is an apocalyptic number.

78213803 is a deficient number, since it is larger than the sum of its proper divisors (1).

78213803 is an equidigital number, since it uses as much as digits as its factorization.

78213803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 78213803 is about 8843.8567944082. The cubic root of 78213803 is about 427.6558997306.

The spelling of 78213803 in words is "seventy-eight million, two hundred thirteen thousand, eight hundred three".