91072008 has 24 divisors (see below), whose sum is σ = 246653550. Its totient is φ = 30357312.

The previous prime is 91071971. The next prime is 91072021. The reversal of 91072008 is 80027019.

It can be written as a sum of positive squares in only one way, i.e., 89529444 + 1542564 = 9462^2 + 1242^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×91072008² = 16588221282304128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 632373 + ... + 632516.

Almost surely, 2^91072008 is an apocalyptic number.

It is an amenable number.

91072008 is an abundant number, since it is smaller than the sum of its proper divisors (155581542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91072008 is a wasteful number, since it uses less digits than its factorization.

91072008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264901 (or 1264894 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 91072008 is about 9543.1655125540. The cubic root of 91072008 is about 449.9127534560.

The spelling of 91072008 in words is "ninety-one million, seventy-two thousand, eight".