78284357 has 2 divisors, whose sum is σ = 78284358. Its totient is φ = 78284356.

The previous prime is 78284347. The next prime is 78284377. The reversal of 78284357 is 75348287.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62236321 + 16048036 = 7889^2 + 4006^2 .

It is a cyclic number.

It is not a de Polignac number, because 78284357 - 2¹⁰ = 78283333 is a prime.

It is a super-2 number, since 2×78284357² = 12256881101806898, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78284347) 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, 39142178 + 39142179.

It is an arithmetic number, because the mean of its divisors is an integer number (39142179).

Almost surely, 2^78284357 is an apocalyptic number.

It is an amenable number.

78284357 is a deficient number, since it is larger than the sum of its proper divisors (1).

78284357 is an equidigital number, since it uses as much as digits as its factorization.

78284357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 376320, while the sum is 44.

The square root of 78284357 is about 8847.8447658173. The cubic root of 78284357 is about 427.7844523436.

The spelling of 78284357 in words is "seventy-eight million, two hundred eighty-four thousand, three hundred fifty-seven".