1621274272 has 24 divisors (see below), whose sum is σ = 3221721216. Its totient is φ = 803059392.

The previous prime is 1621274267. The next prime is 1621274273. The reversal of 1621274272 is 2724721261.

It is not an unprimeable number, because it can be changed into a prime (1621274273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233328 + ... + 240175.

It is an arithmetic number, because the mean of its divisors is an integer number (134238384).

Almost surely, 2^1621274272 is an apocalyptic number.

It is an amenable number.

1621274272 is a deficient number, since it is larger than the sum of its proper divisors (1600446944).

1621274272 is a wasteful number, since it uses less digits than its factorization.

1621274272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473620 (or 473612 counting only the distinct ones).

The product of its digits is 18816, while the sum is 34.

The square root of 1621274272 is about 40265.0502545322. The cubic root of 1621274272 is about 1174.7681503012.

The spelling of 1621274272 in words is "one billion, six hundred twenty-one million, two hundred seventy-four thousand, two hundred seventy-two".