28620642 has 16 divisors (see below), whose sum is σ = 57324960. Its totient is φ = 9526272.

The previous prime is 28620637. The next prime is 28620643. The reversal of 28620642 is 24602682.

It is a super-3 number, since 3×28620642³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (28620643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1513 + ... + 7715.

It is an arithmetic number, because the mean of its divisors is an integer number (3582810).

Almost surely, 2^28620642 is an apocalyptic number.

28620642 is an abundant number, since it is smaller than the sum of its proper divisors (28704318).

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

28620642 is a wasteful number, since it uses less digits than its factorization.

28620642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6977.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 28620642 is about 5349.8263523221. The cubic root of 28620642 is about 305.8861338914.

The spelling of 28620642 in words is "twenty-eight million, six hundred twenty thousand, six hundred forty-two".