15622009920 has 840 divisors, whose sum is σ = 64895086872. Its totient is φ = 3552215040.

The previous prime is 15622009891. The next prime is 15622009933. The reversal of 15622009920 is 2990022651.

It is a happy number.

15622009920 is a `hidden beast` number, since 1 + 5 + 622 + 0 + 0 + 9 + 9 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7181545536 + 8440464384 = 84744^2 + 91872^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 53317294 + ... + 53317586.

Almost surely, 2^15622009920 is an apocalyptic number.

15622009920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15622009920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32447543436).

15622009920 is an abundant number, since it is smaller than the sum of its proper divisors (49273076952).

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

15622009920 is a wasteful number, since it uses less digits than its factorization.

15622009920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 331 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The spelling of 15622009920 in words is "fifteen billion, six hundred twenty-two million, nine thousand, nine hundred twenty".