90400004 has 6 divisors (see below), whose sum is σ = 158200014. Its totient is φ = 45200000.

The previous prime is 90400003. The next prime is 90400019. The reversal of 90400004 is 40000409.

It can be written as a sum of positive squares in only one way, i.e., 89680900 + 719104 = 9470^2 + 848^2 .

It is not an unprimeable number, because it can be changed into a prime (90400001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11299997 + ... + 11300004.

It is an arithmetic number, because the mean of its divisors is an integer number (26366669).

Almost surely, 2^90400004 is an apocalyptic number.

It is an amenable number.

90400004 is a deficient number, since it is larger than the sum of its proper divisors (67800010).

90400004 is a wasteful number, since it uses less digits than its factorization.

90400004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22600005 (or 22600003 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 90400004 is about 9507.8916695553. The cubic root of 90400004 is about 448.8034119379.

The spelling of 90400004 in words is "ninety million, four hundred thousand, four".