78269357 has 2 divisors, whose sum is σ = 78269358. Its totient is φ = 78269356.

The previous prime is 78269353. The next prime is 78269363. The reversal of 78269357 is 75396287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75238276 + 3031081 = 8674^2 + 1741^2 .

It is a cyclic number.

It is not a de Polignac number, because 78269357 - 2² = 78269353 is a prime.

It is a super-2 number, since 2×78269357² = 12252184490386898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78269351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39134678 + 39134679.

It is an arithmetic number, because the mean of its divisors is an integer number (39134679).

Almost surely, 2^78269357 is an apocalyptic number.

It is an amenable number.

78269357 is a deficient number, since it is larger than the sum of its proper divisors (1).

78269357 is an equidigital number, since it uses as much as digits as its factorization.

78269357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 47.

The square root of 78269357 is about 8846.9970611502. The cubic root of 78269357 is about 427.7571281250.

The spelling of 78269357 in words is "seventy-eight million, two hundred sixty-nine thousand, three hundred fifty-seven".