90197810 has 8 divisors (see below), whose sum is σ = 162356076. Its totient is φ = 36079120.

The previous prime is 90197803. The next prime is 90197839. The reversal of 90197810 is 1879109.

It can be written as a sum of positive squares in 2 ways, for example, as 87478609 + 2719201 = 9353^2 + 1649^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×90197810² = 16271289857592200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4509881 + ... + 4509900.

Almost surely, 2^90197810 is an apocalyptic number.

90197810 is a deficient number, since it is larger than the sum of its proper divisors (72158266).

90197810 is a wasteful number, since it uses less digits than its factorization.

90197810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9019788.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 90197810 is about 9497.2527606672. The cubic root of 90197810 is about 448.4685554013.

The spelling of 90197810 in words is "ninety million, one hundred ninety-seven thousand, eight hundred ten".