1057821428 has 48 divisors (see below), whose sum is σ = 2042288640. Its totient is φ = 477180000.

The previous prime is 1057821419. The next prime is 1057821431. The reversal of 1057821428 is 8241287501.

It is a super-2 number, since 2×1057821428² = 2237972347071918368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 1057821391 and 1057821400.

It is a congruent number.

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, 437543 + ... + 439953.

It is an arithmetic number, because the mean of its divisors is an integer number (42547680).

Almost surely, 2^1057821428 is an apocalyptic number.

It is an amenable number.

1057821428 is a deficient number, since it is larger than the sum of its proper divisors (984467212).

1057821428 is a wasteful number, since it uses less digits than its factorization.

1057821428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2708 (or 2706 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 38.

The square root of 1057821428 is about 32524.1668302203. The cubic root of 1057821428 is about 1018.9138213322.

The spelling of 1057821428 in words is "one billion, fifty-seven million, eight hundred twenty-one thousand, four hundred twenty-eight".