621646552 has 16 divisors (see below), whose sum is σ = 1205780400. Its totient is φ = 300105120.

The previous prime is 621646549. The next prime is 621646559. The reversal of 621646552 is 255646126.

It is a super-2 number, since 2×621646552² = 772888871226977408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621646559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1339524 + ... + 1339987.

It is an arithmetic number, because the mean of its divisors is an integer number (75361275).

Almost surely, 2^621646552 is an apocalyptic number.

It is an amenable number.

621646552 is a deficient number, since it is larger than the sum of its proper divisors (584133848).

621646552 is a wasteful number, since it uses less digits than its factorization.

621646552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2679546 (or 2679542 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 621646552 is about 24932.8408329256. The cubic root of 621646552 is about 853.4560794838.

The spelling of 621646552 in words is "six hundred twenty-one million, six hundred forty-six thousand, five hundred fifty-two".