720186428 has 12 divisors (see below), whose sum is σ = 1357274520. Its totient is φ = 332393712.

The previous prime is 720186413. The next prime is 720186449. The reversal of 720186428 is 824681027.

It is a junction number, because it is equal to n+sod(n) for n = 720186391 and 720186400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6924818 + ... + 6924921.

It is an arithmetic number, because the mean of its divisors is an integer number (113106210).

Almost surely, 2^720186428 is an apocalyptic number.

It is an amenable number.

720186428 is a deficient number, since it is larger than the sum of its proper divisors (637088092).

720186428 is a wasteful number, since it uses less digits than its factorization.

720186428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13849756 (or 13849754 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 720186428 is about 26836.2893858298. The cubic root of 720186428 is about 896.3582999806.

The spelling of 720186428 in words is "seven hundred twenty million, one hundred eighty-six thousand, four hundred twenty-eight".