74780077 has 2 divisors, whose sum is σ = 74780078. Its totient is φ = 74780076.

The previous prime is 74780047. The next prime is 74780087. The reversal of 74780077 is 77008747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50779876 + 24000201 = 7126^2 + 4899^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74780077 is a prime.

It is a super-2 number, since 2×74780077² = 11184119832251858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74780047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37390038 + 37390039.

It is an arithmetic number, because the mean of its divisors is an integer number (37390039).

Almost surely, 2^74780077 is an apocalyptic number.

It is an amenable number.

74780077 is a deficient number, since it is larger than the sum of its proper divisors (1).

74780077 is an equidigital number, since it uses as much as digits as its factorization.

74780077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 76832, while the sum is 40.

The square root of 74780077 is about 8647.5474557819. The cubic root of 74780077 is about 421.3037285559.

The spelling of 74780077 in words is "seventy-four million, seven hundred eighty thousand, seventy-seven".