1678653812 has 18 divisors (see below), whose sum is σ = 3228981714. Its totient is φ = 763024240.

The previous prime is 1678653811. The next prime is 1678653841. The reversal of 1678653812 is 2183568761.

It can be written as a sum of positive squares in only one way, i.e., 1670847376 + 7806436 = 40876^2 + 2794^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678653811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1733663 + ... + 1734630.

It is an arithmetic number, because the mean of its divisors is an integer number (179387873).

Almost surely, 2^1678653812 is an apocalyptic number.

It is an amenable number.

1678653812 is a deficient number, since it is larger than the sum of its proper divisors (1550327902).

1678653812 is a wasteful number, since it uses less digits than its factorization.

1678653812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3468319 (or 3468306 counting only the distinct ones).

The product of its digits is 483840, while the sum is 47.

The square root of 1678653812 is about 40971.3779607179. The cubic root of 1678653812 is about 1188.4667804494.

The spelling of 1678653812 in words is "one billion, six hundred seventy-eight million, six hundred fifty-three thousand, eight hundred twelve".