1621543448 has 32 divisors (see below), whose sum is σ = 3657619200. Its totient is φ = 658370592.

The previous prime is 1621543411. The next prime is 1621543477. The reversal of 1621543448 is 8443451261.

It is a happy number.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 760940 + ... + 763067.

It is an arithmetic number, because the mean of its divisors is an integer number (114300600).

Almost surely, 2^1621543448 is an apocalyptic number.

It is an amenable number.

1621543448 is an abundant number, since it is smaller than the sum of its proper divisors (2036075752).

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

1621543448 is a wasteful number, since it uses less digits than its factorization.

1621543448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1524039 (or 1524035 counting only the distinct ones).

The product of its digits is 92160, while the sum is 38.

The square root of 1621543448 is about 40268.3926672024. The cubic root of 1621543448 is about 1174.8331612822.

The spelling of 1621543448 in words is "one billion, six hundred twenty-one million, five hundred forty-three thousand, four hundred forty-eight".