90691402 has 4 divisors (see below), whose sum is σ = 136037106. Its totient is φ = 45345700.

The previous prime is 90691373. The next prime is 90691453. The reversal of 90691402 is 20419609.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 80838081 + 9853321 = 8991^2 + 3139^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22672849 + ... + 22672852.

Almost surely, 2^90691402 is an apocalyptic number.

90691402 is a deficient number, since it is larger than the sum of its proper divisors (45345704).

90691402 is a wasteful number, since it uses less digits than its factorization.

90691402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45345703.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 90691402 is about 9523.2033476137. The cubic root of 90691402 is about 449.2851233741.

The spelling of 90691402 in words is "ninety million, six hundred ninety-one thousand, four hundred two".