78362261 has 2 divisors, whose sum is σ = 78362262. Its totient is φ = 78362260.

The previous prime is 78362257. The next prime is 78362267. The reversal of 78362261 is 16226387.

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., 77880625 + 481636 = 8825^2 + 694^2 .

It is a cyclic number.

It is not a de Polignac number, because 78362261 - 2² = 78362257 is a prime.

It is a super-2 number, since 2×78362261² = 12281287898064242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78362267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39181130 + 39181131.

It is an arithmetic number, because the mean of its divisors is an integer number (39181131).

Almost surely, 2^78362261 is an apocalyptic number.

It is an amenable number.

78362261 is a deficient number, since it is larger than the sum of its proper divisors (1).

78362261 is an equidigital number, since it uses as much as digits as its factorization.

78362261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 35.

The square root of 78362261 is about 8852.2460991547. The cubic root of 78362261 is about 427.9263072967.

The spelling of 78362261 in words is "seventy-eight million, three hundred sixty-two thousand, two hundred sixty-one".