78374899 has 2 divisors, whose sum is σ = 78374900. Its totient is φ = 78374898.

The previous prime is 78374861. The next prime is 78374927. The reversal of 78374899 is 99847387.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78374899 - 2¹¹ = 78372851 is a prime.

It is a super-2 number, since 2×78374899² = 12285249586520402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78374809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39187449 + 39187450.

It is an arithmetic number, because the mean of its divisors is an integer number (39187450).

Almost surely, 2^78374899 is an apocalyptic number.

78374899 is a deficient number, since it is larger than the sum of its proper divisors (1).

78374899 is an equidigital number, since it uses as much as digits as its factorization.

78374899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 55.

The square root of 78374899 is about 8852.9599005079. The cubic root of 78374899 is about 427.9493108951.

The spelling of 78374899 in words is "seventy-eight million, three hundred seventy-four thousand, eight hundred ninety-nine".