87890623 has 2 divisors, whose sum is σ = 87890624. Its totient is φ = 87890622.

The previous prime is 87890617. The next prime is 87890657. The reversal of 87890623 is 32609878.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87890623 - 2⁵ = 87890591 is a prime.

It is a super-2 number, since 2×87890623² = 15449523222656258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87890623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87890603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43945311 + 43945312.

It is an arithmetic number, because the mean of its divisors is an integer number (43945312).

Almost surely, 2^87890623 is an apocalyptic number.

87890623 is a deficient number, since it is larger than the sum of its proper divisors (1).

87890623 is an equidigital number, since it uses as much as digits as its factorization.

87890623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 87890623 is about 9374.9998933333. Note that the first 3 decimals coincide. The cubic root of 87890623 is about 444.6116596888.

The spelling of 87890623 in words is "eighty-seven million, eight hundred ninety thousand, six hundred twenty-three".