28415988 has 24 divisors (see below), whose sum is σ = 73671360. Its totient is φ = 9471960.

The previous prime is 28415987. The next prime is 28416013. The reversal of 28415988 is 88951482.

It is a happy number.

It is a super-2 number, since 2×28415988² = 1614936748032288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28415983) 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, 131448 + ... + 131663.

It is an arithmetic number, because the mean of its divisors is an integer number (3069640).

Almost surely, 2^28415988 is an apocalyptic number.

It is an amenable number.

28415988 is an abundant number, since it is smaller than the sum of its proper divisors (45255372).

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

28415988 is a wasteful number, since it uses less digits than its factorization.

28415988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263124 (or 263116 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 28415988 is about 5330.6648741034. The cubic root of 28415988 is about 305.1553020787.

It can be divided in two parts, 28415 and 988, that added together give a triangular number (29403 = T₂₄₂).

The spelling of 28415988 in words is "twenty-eight million, four hundred fifteen thousand, nine hundred eighty-eight".