124721928 has 192 divisors, whose sum is σ = 390873600. Its totient is φ = 35665920.

The previous prime is 124721903. The next prime is 124721941. The reversal of 124721928 is 829127421.

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

Its product of digits (16128) is a multiple of the sum of its prime factors (252).

It is a junction number, because it is equal to n+sod(n) for n = 124721892 and 124721901.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 720850 + ... + 721022.

It is an arithmetic number, because the mean of its divisors is an integer number (2035800).

Almost surely, 2^124721928 is an apocalyptic number.

124721928 is a gapful number since it is divisible by the number (18) 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 124721928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195436800).

124721928 is an abundant number, since it is smaller than the sum of its proper divisors (266151672).

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

124721928 is a wasteful number, since it uses less digits than its factorization.

124721928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252 (or 245 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 124721928 is about 11167.8972058306. The cubic root of 124721928 is about 499.6289620631.

It can be divided in two parts, 12472 and 1928, that added together give a square (14400 = 120²).

The spelling of 124721928 in words is "one hundred twenty-four million, seven hundred twenty-one thousand, nine hundred twenty-eight".