670905947 has 2 divisors, whose sum is σ = 670905948. Its totient is φ = 670905946.

The previous prime is 670905887. The next prime is 670905997. The reversal of 670905947 is 749509076.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 670905947 - 2¹⁶ = 670840411 is a prime.

It is a super-2 number, since 2×670905947² = 900229579439933618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (670905997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335452973 + 335452974.

It is an arithmetic number, because the mean of its divisors is an integer number (335452974).

Almost surely, 2^670905947 is an apocalyptic number.

670905947 is a deficient number, since it is larger than the sum of its proper divisors (1).

670905947 is an equidigital number, since it uses as much as digits as its factorization.

670905947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 476280, while the sum is 47.

The square root of 670905947 is about 25901.8521924591. The cubic root of 670905947 is about 875.4282298979.

It can be divided in two parts, 67090 and 5947, that added together give a palindrome (73037).

The spelling of 670905947 in words is "six hundred seventy million, nine hundred five thousand, nine hundred forty-seven".