90780947 has 2 divisors, whose sum is σ = 90780948. Its totient is φ = 90780946.

The previous prime is 90780887. The next prime is 90780953. The reversal of 90780947 is 74908709.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90780947 - 2¹⁴ = 90764563 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90780898 and 90780907.

It is not a weakly prime, because it can be changed into another prime (90780967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45390473 + 45390474.

It is an arithmetic number, because the mean of its divisors is an integer number (45390474).

Almost surely, 2^90780947 is an apocalyptic number.

90780947 is a deficient number, since it is larger than the sum of its proper divisors (1).

90780947 is an equidigital number, since it uses as much as digits as its factorization.

90780947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 90780947 is about 9527.9035994284. The cubic root of 90780947 is about 449.4329433506.

The spelling of 90780947 in words is "ninety million, seven hundred eighty thousand, nine hundred forty-seven".