28621701 has 16 divisors (see below), whose sum is σ = 42529600. Its totient is φ = 19023984.

The previous prime is 28621699. The next prime is 28621709. The reversal of 28621701 is 10712682.

It is not a de Polignac number, because 28621701 - 2¹ = 28621699 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28621709) 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, 8835 + ... + 11631.

It is an arithmetic number, because the mean of its divisors is an integer number (2658100).

Almost surely, 2^28621701 is an apocalyptic number.

It is an amenable number.

28621701 is a deficient number, since it is larger than the sum of its proper divisors (13907899).

28621701 is a wasteful number, since it uses less digits than its factorization.

28621701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3185 (or 3179 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 28621701 is about 5349.9253265817. The cubic root of 28621701 is about 305.8899065696.

The spelling of 28621701 in words is "twenty-eight million, six hundred twenty-one thousand, seven hundred one".