90606978 has 144 divisors (see below), whose sum is σ = 258360480. Its totient is φ = 23451120.

The previous prime is 90606961. The next prime is 90606979. The reversal of 90606978 is 87960609.

It is not an unprimeable number, because it can be changed into a prime (90606979) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 320025 + ... + 320307.

It is an arithmetic number, because the mean of its divisors is an integer number (1794170).

Almost surely, 2^90606978 is an apocalyptic number.

90606978 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 90606978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129180240).

90606978 is an abundant number, since it is smaller than the sum of its proper divisors (167753502).

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

90606978 is a wasteful number, since it uses less digits than its factorization.

90606978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 90606978 is about 9518.7697734529. The cubic root of 90606978 is about 449.1456679526.

The spelling of 90606978 in words is "ninety million, six hundred six thousand, nine hundred seventy-eight".