670821487 has 16 divisors (see below), whose sum is σ = 782232832. Its totient is φ = 563397120.

The previous prime is 670821451. The next prime is 670821511. The reversal of 670821487 is 784128076.

It is a cyclic number.

It is not a de Polignac number, because 670821487 - 2¹⁵ = 670788719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670821187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86812 + ... + 94222.

It is an arithmetic number, because the mean of its divisors is an integer number (48889552).

Almost surely, 2^670821487 is an apocalyptic number.

670821487 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

670821487 is the 14954-th hex number.

670821487 is a deficient number, since it is larger than the sum of its proper divisors (111411345).

670821487 is a wasteful number, since it uses less digits than its factorization.

670821487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7678.

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 670821487 is about 25900.2217558074. The cubic root of 670821487 is about 875.3914926217.

The spelling of 670821487 in words is "six hundred seventy million, eight hundred twenty-one thousand, four hundred eighty-seven".