90999956 has 6 divisors (see below), whose sum is σ = 159249930. Its totient is φ = 45499976.

The previous prime is 90999947. The next prime is 90999959. The reversal of 90999956 is 65999909.

It can be written as a sum of positive squares in only one way, i.e., 90250000 + 749956 = 9500^2 + 866^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90999959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11374991 + ... + 11374998.

It is an arithmetic number, because the mean of its divisors is an integer number (26541655).

Almost surely, 2^90999956 is an apocalyptic number.

It is an amenable number.

90999956 is a deficient number, since it is larger than the sum of its proper divisors (68249974).

90999956 is a wasteful number, since it uses less digits than its factorization.

90999956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22749993 (or 22749991 counting only the distinct ones).

The product of its (nonzero) digits is 1771470, while the sum is 56.

The square root of 90999956 is about 9539.3897079425. The cubic root of 90999956 is about 449.7940720332.

The spelling of 90999956 in words is "ninety million, nine hundred ninety-nine thousand, nine hundred fifty-six".