678388732 has 18 divisors (see below), whose sum is σ = 1381006032. Its totient is φ = 290737944.

The previous prime is 678388691. The next prime is 678388759. The reversal of 678388732 is 237883876.

It is a super-2 number, since 2×678388732² = 920422543409135648, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 678388732.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1730388 + ... + 1730779.

Almost surely, 2^678388732 is an apocalyptic number.

It is an amenable number.

678388732 is an abundant number, since it is smaller than the sum of its proper divisors (702617300).

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

678388732 is a wasteful number, since it uses less digits than its factorization.

678388732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3461185 (or 3461176 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 52.

The square root of 678388732 is about 26045.8966441933. The cubic root of 678388732 is about 878.6708291464.

The spelling of 678388732 in words is "six hundred seventy-eight million, three hundred eighty-eight thousand, seven hundred thirty-two".