90738781 has 32 divisors (see below), whose sum is σ = 110992896. Its totient is φ = 72576000.

The previous prime is 90738773. The next prime is 90738787. The reversal of 90738781 is 18783709.

90738781 = T₄₂₈ + T₄₂₉ + ... + T₈₅₃.

It is not a de Polignac number, because 90738781 - 2³ = 90738773 is a prime.

It is a super-2 number, since 2×90738781² = 16467052754731922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90738787) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1242961 + ... + 1243033.

It is an arithmetic number, because the mean of its divisors is an integer number (3468528).

Almost surely, 2^90738781 is an apocalyptic number.

It is an amenable number.

90738781 is a deficient number, since it is larger than the sum of its proper divisors (20254115).

90738781 is a wasteful number, since it uses less digits than its factorization.

90738781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 90738781 is about 9525.6905786405. The cubic root of 90738781 is about 449.3633482613.

It can be divided in two parts, 90738 and 781, that added together give a palindrome (91519).

The spelling of 90738781 in words is "ninety million, seven hundred thirty-eight thousand, seven hundred eighty-one".