90431780 has 24 divisors (see below), whose sum is σ = 193492152. Its totient is φ = 35489792.

The previous prime is 90431767. The next prime is 90431827. The reversal of 90431780 is 8713409.

It can be written as a sum of positive squares in 4 ways, for example, as 46977316 + 43454464 = 6854^2 + 6592^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41597 + ... + 43716.

It is an arithmetic number, because the mean of its divisors is an integer number (8062173).

Almost surely, 2^90431780 is an apocalyptic number.

It is an amenable number.

90431780 is an abundant number, since it is smaller than the sum of its proper divisors (103060372).

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

90431780 is a wasteful number, since it uses less digits than its factorization.

90431780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85375 (or 85373 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 90431780 is about 9509.5625556594. The cubic root of 90431780 is about 448.8559912371.

The spelling of 90431780 in words is "ninety million, four hundred thirty-one thousand, seven hundred eighty".