90420629 has 4 divisors (see below), whose sum is σ = 97376076. Its totient is φ = 83465184.

The previous prime is 90420599. The next prime is 90420641. The reversal of 90420629 is 92602409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92602409 = 19 ⋅4873811.

It can be written as a sum of positive squares in 2 ways, for example, as 6240004 + 84180625 = 2498^2 + 9175^2 .

It is a cyclic number.

It is not a de Polignac number, because 90420629 - 2¹² = 90416533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90420595 and 90420604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90420689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3477704 + ... + 3477729.

It is an arithmetic number, because the mean of its divisors is an integer number (24344019).

Almost surely, 2^90420629 is an apocalyptic number.

It is an amenable number.

90420629 is a deficient number, since it is larger than the sum of its proper divisors (6955447).

90420629 is a wasteful number, since it uses less digits than its factorization.

90420629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6955446.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 90420629 is about 9508.9762330127. The cubic root of 90420629 is about 448.8375412376.

The spelling of 90420629 in words is "ninety million, four hundred twenty thousand, six hundred twenty-nine".