90628457 has 2 divisors, whose sum is σ = 90628458. Its totient is φ = 90628456.

The previous prime is 90628453. The next prime is 90628459. The reversal of 90628457 is 75482609.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80712256 + 9916201 = 8984^2 + 3149^2 .

It is a cyclic number.

It is not a de Polignac number, because 90628457 - 2² = 90628453 is a prime.

Together with 90628459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90628453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45314228 + 45314229.

It is an arithmetic number, because the mean of its divisors is an integer number (45314229).

Almost surely, 2^90628457 is an apocalyptic number.

It is an amenable number.

90628457 is a deficient number, since it is larger than the sum of its proper divisors (1).

90628457 is an equidigital number, since it uses as much as digits as its factorization.

90628457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 90628457 is about 9519.8979511337. The cubic root of 90628457 is about 449.1811561596.

The spelling of 90628457 in words is "ninety million, six hundred twenty-eight thousand, four hundred fifty-seven".