90420747 has 8 divisors (see below), whose sum is σ = 120608256. Its totient is φ = 60256872.

The previous prime is 90420697. The next prime is 90420749. The reversal of 90420747 is 74702409.

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

It is not a de Polignac number, because 90420747 - 2¹⁰ = 90419723 is a prime.

It is a super-2 number, since 2×90420747² = 16351822976076018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90420749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7138 + ... + 15224.

It is an arithmetic number, because the mean of its divisors is an integer number (15076032).

Almost surely, 2^90420747 is an apocalyptic number.

90420747 is a deficient number, since it is larger than the sum of its proper divisors (30187509).

90420747 is a wasteful number, since it uses less digits than its factorization.

90420747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11817.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 90420747 is about 9508.9824376744. The cubic root of 90420747 is about 448.8377364836.

The spelling of 90420747 in words is "ninety million, four hundred twenty thousand, seven hundred forty-seven".