78215803 has 4 divisors (see below), whose sum is σ = 78263280. Its totient is φ = 78168328.

The previous prime is 78215791. The next prime is 78215833. The reversal of 78215803 is 30851287.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78215803 - 2⁵ = 78215771 is a prime.

It is a super-2 number, since 2×78215803² = 12235423677869618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78215833) 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, 21175 + ... + 24592.

It is an arithmetic number, because the mean of its divisors is an integer number (19565820).

Almost surely, 2^78215803 is an apocalyptic number.

78215803 is a deficient number, since it is larger than the sum of its proper divisors (47477).

78215803 is a wasteful number, since it uses less digits than its factorization.

78215803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47476.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 78215803 is about 8843.9698665249. The cubic root of 78215803 is about 427.6595448864.

The spelling of 78215803 in words is "seventy-eight million, two hundred fifteen thousand, eight hundred three".