678988220 has 24 divisors (see below), whose sum is σ = 1426680864. Its totient is φ = 271441856.

The previous prime is 678988213. The next prime is 678988229. The reversal of 678988220 is 22889876.

It is a super-2 number, since 2×678988220² = 922050005797536800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678988229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30857 + ... + 48063.

It is an arithmetic number, because the mean of its divisors is an integer number (59445036).

Almost surely, 2^678988220 is an apocalyptic number.

It is an amenable number.

678988220 is an abundant number, since it is smaller than the sum of its proper divisors (747692644).

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

678988220 is a wasteful number, since it uses less digits than its factorization.

678988220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19189 (or 19187 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 50.

The square root of 678988220 is about 26057.4024031560. The cubic root of 678988220 is about 878.9295783004.

The spelling of 678988220 in words is "six hundred seventy-eight million, nine hundred eighty-eight thousand, two hundred twenty".