720667388 has 48 divisors (see below), whose sum is σ = 1479905280. Its totient is φ = 300703104.

The previous prime is 720667333. The next prime is 720667393. The reversal of 720667388 is 883766027.

It is a super-2 number, since 2×720667388² = 1038722968253485088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159245 + ... + 163707.

It is an arithmetic number, because the mean of its divisors is an integer number (30831360).

Almost surely, 2^720667388 is an apocalyptic number.

It is an amenable number.

720667388 is an abundant number, since it is smaller than the sum of its proper divisors (759237892).

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

720667388 is a wasteful number, since it uses less digits than its factorization.

720667388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4626 (or 4624 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 47.

The square root of 720667388 is about 26845.2488906324. The cubic root of 720667388 is about 896.5577930272.

The spelling of 720667388 in words is "seven hundred twenty million, six hundred sixty-seven thousand, three hundred eighty-eight".