90778540 has 24 divisors (see below), whose sum is σ = 196785792. Its totient is φ = 35139840.

The previous prime is 90778531. The next prime is 90778601. The reversal of 90778540 is 4587709.

It is a junction number, because it is equal to n+sod(n) for n = 90778493 and 90778502.

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, 72589 + ... + 73828.

It is an arithmetic number, because the mean of its divisors is an integer number (8199408).

Almost surely, 2^90778540 is an apocalyptic number.

It is an amenable number.

90778540 is an abundant number, since it is smaller than the sum of its proper divisors (106007252).

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

90778540 is a wasteful number, since it uses less digits than its factorization.

90778540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146457 (or 146455 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 90778540 is about 9527.7772853903. Note that the first 3 decimals coincide. The cubic root of 90778540 is about 449.4289711710.

The spelling of 90778540 in words is "ninety million, seven hundred seventy-eight thousand, five hundred forty".