90307640 has 16 divisors (see below), whose sum is σ = 203192280. Its totient is φ = 36123040.

The previous prime is 90307603. The next prime is 90307649. The reversal of 90307640 is 4670309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90307649) 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, 1128806 + ... + 1128885.

Almost surely, 2^90307640 is an apocalyptic number.

It is an amenable number.

90307640 is an abundant number, since it is smaller than the sum of its proper divisors (112884640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90307640 is a wasteful number, since it uses less digits than its factorization.

90307640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2257702 (or 2257698 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 90307640 is about 9503.0331999841. The cubic root of 90307640 is about 448.6505085364.

Adding to 90307640 its reverse (4670309), we get a palindrome (94977949).

The spelling of 90307640 in words is "ninety million, three hundred seven thousand, six hundred forty".