78201077 has 2 divisors, whose sum is σ = 78201078. Its totient is φ = 78201076.

The previous prime is 78201049. The next prime is 78201113. The reversal of 78201077 is 77010287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63138916 + 15062161 = 7946^2 + 3881^2 .

It is a cyclic number.

It is not a de Polignac number, because 78201077 - 2¹² = 78196981 is a prime.

It is a super-2 number, since 2×78201077² = 12230816887919858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78201577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39100538 + 39100539.

It is an arithmetic number, because the mean of its divisors is an integer number (39100539).

Almost surely, 2^78201077 is an apocalyptic number.

It is an amenable number.

78201077 is a deficient number, since it is larger than the sum of its proper divisors (1).

78201077 is an equidigital number, since it uses as much as digits as its factorization.

78201077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5488, while the sum is 32.

The square root of 78201077 is about 8843.1372826616. The cubic root of 78201077 is about 427.6327041480.

The spelling of 78201077 in words is "seventy-eight million, two hundred one thousand, seventy-seven".