10721428 has 6 divisors (see below), whose sum is σ = 18762506. Its totient is φ = 5360712.

The previous prime is 10721419. The next prime is 10721461. The reversal of 10721428 is 82412701.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10575504 + 145924 = 3252^2 + 382^2 .

It is a super-2 number, since 2×10721428² = 229898036718368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1340175 + ... + 1340182.

Almost surely, 2^10721428 is an apocalyptic number.

It is an amenable number.

10721428 is a deficient number, since it is larger than the sum of its proper divisors (8041078).

10721428 is a wasteful number, since it uses less digits than its factorization.

10721428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2680361 (or 2680359 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 10721428 is about 3274.3591739453. The cubic root of 10721428 is about 220.5045444805.

It can be divided in two parts, 1072 and 1428, that added together give a square (2500 = 50²).

The spelling of 10721428 in words is "ten million, seven hundred twenty-one thousand, four hundred twenty-eight".