15145228644 has 48 divisors (see below), whose sum is σ = 43493993088. Its totient is φ = 3994345728.

The previous prime is 15145228633. The next prime is 15145228667. The reversal of 15145228644 is 44682254151.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 15145228596 and 15145228605.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6933537 + ... + 6935720.

It is an arithmetic number, because the mean of its divisors is an integer number (906124856).

Almost surely, 2^15145228644 is an apocalyptic number.

15145228644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

15145228644 is an abundant number, since it is smaller than the sum of its proper divisors (28348764444).

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

15145228644 is a wasteful number, since it uses less digits than its factorization.

15145228644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13869284 (or 13869282 counting only the distinct ones).

The product of its digits is 307200, while the sum is 42.

The spelling of 15145228644 in words is "fifteen billion, one hundred forty-five million, two hundred twenty-eight thousand, six hundred forty-four".