90778317 has 16 divisors (see below), whose sum is σ = 146466432. Its totient is φ = 48821760.

The previous prime is 90778313. The next prime is 90778321. The reversal of 90778317 is 71387709.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90778313) and next prime (90778321).

It is not a de Polignac number, because 90778317 - 2² = 90778313 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90778313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126784 + ... + 127497.

It is an arithmetic number, because the mean of its divisors is an integer number (9154152).

Almost surely, 2^90778317 is an apocalyptic number.

It is an amenable number.

90778317 is a deficient number, since it is larger than the sum of its proper divisors (55688115).

90778317 is a wasteful number, since it uses less digits than its factorization.

90778317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254308.

The product of its (nonzero) digits is 74088, while the sum is 42.

The square root of 90778317 is about 9527.7655827586. The cubic root of 90778317 is about 449.4286031592.

The spelling of 90778317 in words is "ninety million, seven hundred seventy-eight thousand, three hundred seventeen".