10128720 has 80 divisors (see below), whose sum is σ = 35890560. Its totient is φ = 2314752.

The previous prime is 10128709. The next prime is 10128721. The reversal of 10128720 is 2782101.

Added to its reverse (2782101) it gives a triangular number (12910821 = T₅₀₈₁).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10128721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1335 + ... + 4694.

It is an arithmetic number, because the mean of its divisors is an integer number (448632).

Almost surely, 2^10128720 is an apocalyptic number.

10128720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10128720 is an abundant number, since it is smaller than the sum of its proper divisors (25761840).

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

10128720 is a wasteful number, since it uses less digits than its factorization.

10128720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6052 (or 6046 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 10128720 is about 3182.5650032639. The cubic root of 10128720 is about 216.3639269608.

Adding to 10128720 its reverse (2782101), we get a triangular number (12910821 = T₅₀₈₁).

The spelling of 10128720 in words is "ten million, one hundred twenty-eight thousand, seven hundred twenty".