911478640 has 40 divisors (see below), whose sum is σ = 2230727760. Its totient is φ = 345401856.

The previous prime is 911478599. The next prime is 911478649. The reversal of 911478640 is 46874119.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×911478640² = 1661586622352499200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 911478593 and 911478602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (911478649) 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, 298309 + ... + 301348.

It is an arithmetic number, because the mean of its divisors is an integer number (55768194).

Almost surely, 2^911478640 is an apocalyptic number.

It is an amenable number.

911478640 is an abundant number, since it is smaller than the sum of its proper divisors (1319249120).

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

911478640 is a wasteful number, since it uses less digits than its factorization.

911478640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599689 (or 599683 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 911478640 is about 30190.7045297058. The cubic root of 911478640 is about 969.5766884987.

The spelling of 911478640 in words is "nine hundred eleven million, four hundred seventy-eight thousand, six hundred forty".