90378542 has 4 divisors (see below), whose sum is σ = 135567816. Its totient is φ = 45189270.

The previous prime is 90378517. The next prime is 90378551. The reversal of 90378542 is 24587309.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24587309 = 31 ⋅793139.

It is a junction number, because it is equal to n+sod(n) for n = 90378496 and 90378505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22594634 + ... + 22594637.

It is an arithmetic number, because the mean of its divisors is an integer number (33891954).

Almost surely, 2^90378542 is an apocalyptic number.

90378542 is a deficient number, since it is larger than the sum of its proper divisors (45189274).

90378542 is a wasteful number, since it uses less digits than its factorization.

90378542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45189273.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 90378542 is about 9506.7629611766. The cubic root of 90378542 is about 448.7678920973.

The spelling of 90378542 in words is "ninety million, three hundred seventy-eight thousand, five hundred forty-two".