78225019 has 2 divisors, whose sum is σ = 78225020. Its totient is φ = 78225018.

The previous prime is 78225013. The next prime is 78225029. The reversal of 78225019 is 91052287.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78225019 - 2¹¹ = 78222971 is a prime.

It is a super-2 number, since 2×78225019² = 12238307195100722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78225013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39112509 + 39112510.

It is an arithmetic number, because the mean of its divisors is an integer number (39112510).

Almost surely, 2^78225019 is an apocalyptic number.

78225019 is a deficient number, since it is larger than the sum of its proper divisors (1).

78225019 is an equidigital number, since it uses as much as digits as its factorization.

78225019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 78225019 is about 8844.4908841606. The cubic root of 78225019 is about 427.6763409618.

The spelling of 78225019 in words is "seventy-eight million, two hundred twenty-five thousand, nineteen".