90787905 has 96 divisors (see below), whose sum is σ = 185673600. Its totient is φ = 41831424.

The previous prime is 90787901. The next prime is 90787937. The reversal of 90787905 is 50978709.

It is not a de Polignac number, because 90787905 - 2² = 90787901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90787901) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 507106 + ... + 507284.

It is an arithmetic number, because the mean of its divisors is an integer number (1934100).

Almost surely, 2^90787905 is an apocalyptic number.

It is an amenable number.

90787905 is an abundant number, since it is smaller than the sum of its proper divisors (94885695).

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

90787905 is a wasteful number, since it uses less digits than its factorization.

90787905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The square root of 90787905 is about 9528.2687304673. The cubic root of 90787905 is about 449.4444254755. Note that the first 4 decimals are identical.

The spelling of 90787905 in words is "ninety million, seven hundred eighty-seven thousand, nine hundred five".