1695878640 has 80 divisors (see below), whose sum is σ = 5841367200. Its totient is φ = 452233728.

The previous prime is 1695878627. The next prime is 1695878647. The reversal of 1695878640 is 468785961.

1695878640 is a `hidden beast` number, since 16 + 9 + 587 + 8 + 6 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1695878647) 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, 390405 + ... + 394724.

It is an arithmetic number, because the mean of its divisors is an integer number (73017090).

Almost surely, 2^1695878640 is an apocalyptic number.

1695878640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1695878640 is an abundant number, since it is smaller than the sum of its proper divisors (4145488560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1695878640 is a wasteful number, since it uses less digits than its factorization.

1695878640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785151 (or 785139 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The square root of 1695878640 is about 41181.0470969353. The cubic root of 1695878640 is about 1192.5179460137.

The spelling of 1695878640 in words is "one billion, six hundred ninety-five million, eight hundred seventy-eight thousand, six hundred forty".