74978977 has 2 divisors, whose sum is σ = 74978978. Its totient is φ = 74978976.

The previous prime is 74978903. The next prime is 74978989. The reversal of 74978977 is 77987947.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68823616 + 6155361 = 8296^2 + 2481^2 .

It is an emirp because it is prime and its reverse (77987947) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74978977 - 2²³ = 66590369 is a prime.

It is not a weakly prime, because it can be changed into another prime (74978077) 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, 37489488 + 37489489.

It is an arithmetic number, because the mean of its divisors is an integer number (37489489).

Almost surely, 2^74978977 is an apocalyptic number.

It is an amenable number.

74978977 is a deficient number, since it is larger than the sum of its proper divisors (1).

74978977 is an equidigital number, since it uses as much as digits as its factorization.

74978977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6223392, while the sum is 58.

The square root of 74978977 is about 8659.0401893050. The cubic root of 74978977 is about 421.6769256688.

The spelling of 74978977 in words is "seventy-four million, nine hundred seventy-eight thousand, nine hundred seventy-seven".