1670685387 has 32 divisors (see below), whose sum is σ = 2782531584. Its totient is φ = 869529600.

The previous prime is 1670685377. The next prime is 1670685403. The reversal of 1670685387 is 7835860761.

It is not a de Polignac number, because 1670685387 - 2⁶ = 1670685323 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (1670685307) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64414 + ... + 86547.

It is an arithmetic number, because the mean of its divisors is an integer number (86954112).

Almost surely, 2^1670685387 is an apocalyptic number.

1670685387 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1670685387 is a deficient number, since it is larger than the sum of its proper divisors (1111846197).

1670685387 is a wasteful number, since it uses less digits than its factorization.

1670685387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151019.

The product of its (nonzero) digits is 1693440, while the sum is 51.

The square root of 1670685387 is about 40874.0184836284. The cubic root of 1670685387 is about 1186.5832805611.

The spelling of 1670685387 in words is "one billion, six hundred seventy million, six hundred eighty-five thousand, three hundred eighty-seven".