78146377 has 2 divisors, whose sum is σ = 78146378. Its totient is φ = 78146376.

The previous prime is 78146357. The next prime is 78146407. The reversal of 78146377 is 77364187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77633721 + 512656 = 8811^2 + 716^2 .

It is an emirp because it is prime and its reverse (77364187) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78146377 is a prime.

It is a super-2 number, since 2×78146377² = 12213712476452258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78146357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39073188 + 39073189.

It is an arithmetic number, because the mean of its divisors is an integer number (39073189).

Almost surely, 2^78146377 is an apocalyptic number.

It is an amenable number.

78146377 is a deficient number, since it is larger than the sum of its proper divisors (1).

78146377 is an equidigital number, since it uses as much as digits as its factorization.

78146377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 197568, while the sum is 43.

The square root of 78146377 is about 8840.0439478546. The cubic root of 78146377 is about 427.5329742129.

The spelling of 78146377 in words is "seventy-eight million, one hundred forty-six thousand, three hundred seventy-seven".