78270553 has 2 divisors, whose sum is σ = 78270554. Its totient is φ = 78270552.

The previous prime is 78270551. The next prime is 78270581. The reversal of 78270553 is 35507287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71859529 + 6411024 = 8477^2 + 2532^2 .

It is an emirp because it is prime and its reverse (35507287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78270553 - 2¹ = 78270551 is a prime.

It is a super-2 number, since 2×78270553² = 12252558933851618, which contains 22 as substring.

Together with 78270551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78270551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39135276 + 39135277.

It is an arithmetic number, because the mean of its divisors is an integer number (39135277).

Almost surely, 2^78270553 is an apocalyptic number.

It is an amenable number.

78270553 is a deficient number, since it is larger than the sum of its proper divisors (1).

78270553 is an equidigital number, since it uses as much as digits as its factorization.

78270553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58800, while the sum is 37.

The square root of 78270553 is about 8847.0646544490. The cubic root of 78270553 is about 427.7593069041.

The spelling of 78270553 in words is "seventy-eight million, two hundred seventy thousand, five hundred fifty-three".