90725487 has 4 divisors (see below), whose sum is σ = 120967320. Its totient is φ = 60483656.

The previous prime is 90725477. The next prime is 90725489. The reversal of 90725487 is 78452709.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78452709 = 3 ⋅26150903.

It is a cyclic number.

It is not a de Polignac number, because 90725487 - 2⁴ = 90725471 is a prime.

It is a super-2 number, since 2×90725487² = 16462227982774338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90725489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15120912 + ... + 15120917.

It is an arithmetic number, because the mean of its divisors is an integer number (30241830).

Almost surely, 2^90725487 is an apocalyptic number.

90725487 is a deficient number, since it is larger than the sum of its proper divisors (30241833).

90725487 is a wasteful number, since it uses less digits than its factorization.

90725487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30241832.

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 90725487 is about 9524.9927559028. The cubic root of 90725487 is about 449.3414020105.

The spelling of 90725487 in words is "ninety million, seven hundred twenty-five thousand, four hundred eighty-seven".