1621265088 has 56 divisors (see below), whose sum is σ = 4305564160. Its totient is φ = 538410240.

The previous prime is 1621265083. The next prime is 1621265111. The reversal of 1621265088 is 8805621261.

It is not an unprimeable number, because it can be changed into a prime (1621265083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36453 + ... + 67611.

Almost surely, 2^1621265088 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621265088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2152782080).

1621265088 is an abundant number, since it is smaller than the sum of its proper divisors (2684299072).

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

1621265088 is a wasteful number, since it uses less digits than its factorization.

1621265088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31445 (or 31435 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 1621265088 is about 40264.9362100575. The cubic root of 1621265088 is about 1174.7659320684.

The spelling of 1621265088 in words is "one billion, six hundred twenty-one million, two hundred sixty-five thousand, eighty-eight".