15645420 has 96 divisors (see below), whose sum is σ = 55641600. Its totient is φ = 3575232.

The previous prime is 15645419. The next prime is 15645437. The reversal of 15645420 is 2454651.

15645420 is a `hidden beast` number, since 15 + 645 + 4 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1711 + ... + 5849.

It is an arithmetic number, because the mean of its divisors is an integer number (579600).

Almost surely, 2^15645420 is an apocalyptic number.

15645420 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 15645420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27820800).

15645420 is an abundant number, since it is smaller than the sum of its proper divisors (39996180).

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

15645420 is a wasteful number, since it uses less digits than its factorization.

15645420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4164 (or 4156 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 15645420 is about 3955.4291802534. The cubic root of 15645420 is about 250.1088592584.

The spelling of 15645420 in words is "fifteen million, six hundred forty-five thousand, four hundred twenty".