3975621955428 has 36 divisors (see below), whose sum is σ = 9764759452560. Its totient is φ = 1255450057344.

The previous prime is 3975621955423. The next prime is 3975621955537. The reversal of 3975621955428 is 8245591265793.

It is not an unprimeable number, because it can be changed into a prime (3975621955423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30041148 + ... + 30173196.

Almost surely, 2^{3975621955428} is an apocalyptic number.

3975621955428 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

3975621955428 is an abundant number, since it is smaller than the sum of its proper divisors (5789137497132).

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

3975621955428 is an frugal number, since it uses more digits than its factorization.

3975621955428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264124 (or 132073 counting only the distinct ones).

The product of its digits is 163296000, while the sum is 66.

The spelling of 3975621955428 in words is "three trillion, nine hundred seventy-five billion, six hundred twenty-one million, nine hundred fifty-five thousand, four hundred twenty-eight".