15625212420 has 24 divisors (see below), whose sum is σ = 43750594944. Its totient is φ = 4166723296.

The previous prime is 15625212409. The next prime is 15625212439. The reversal of 15625212420 is 2421252651.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 130210044 + ... + 130210163.

It is an arithmetic number, because the mean of its divisors is an integer number (1822941456).

Almost surely, 2^15625212420 is an apocalyptic number.

15625212420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15625212420 is an abundant number, since it is smaller than the sum of its proper divisors (28125382524).

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

15625212420 is a wasteful number, since it uses less digits than its factorization.

15625212420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260420219 (or 260420217 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The spelling of 15625212420 in words is "fifteen billion, six hundred twenty-five million, two hundred twelve thousand, four hundred twenty".