90781654 has 4 divisors (see below), whose sum is σ = 136172484. Its totient is φ = 45390826.

The previous prime is 90781637. The next prime is 90781657. The reversal of 90781654 is 45618709.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45618709 = 83 ⋅549623.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90781657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22695412 + ... + 22695415.

It is an arithmetic number, because the mean of its divisors is an integer number (34043121).

Almost surely, 2^90781654 is an apocalyptic number.

90781654 is a deficient number, since it is larger than the sum of its proper divisors (45390830).

90781654 is a wasteful number, since it uses less digits than its factorization.

90781654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45390829.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 90781654 is about 9527.9407009070. The cubic root of 90781654 is about 449.4341100721.

It can be divided in two parts, 9078165 and 4, that added together give a square (9078169 = 3013²).

The spelling of 90781654 in words is "ninety million, seven hundred eighty-one thousand, six hundred fifty-four".