647790420 has 24 divisors (see below), whose sum is σ = 1813813344. Its totient is φ = 172744096.

The previous prime is 647790397. The next prime is 647790421. The reversal of 647790420 is 24097746.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647790421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5398194 + ... + 5398313.

It is an arithmetic number, because the mean of its divisors is an integer number (75575556).

Almost surely, 2^647790420 is an apocalyptic number.

647790420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

647790420 is an abundant number, since it is smaller than the sum of its proper divisors (1166022924).

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

647790420 is a wasteful number, since it uses less digits than its factorization.

647790420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10796519 (or 10796517 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 647790420 is about 25451.7272498351. The cubic root of 647790420 is about 865.2564399444.

The spelling of 647790420 in words is "six hundred forty-seven million, seven hundred ninety thousand, four hundred twenty".