916391640 has 32 divisors (see below), whose sum is σ = 2749175280. Its totient is φ = 244371072.

The previous prime is 916391633. The next prime is 916391653. The reversal of 916391640 is 46193619.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3818179 + ... + 3818418.

Almost surely, 2^916391640 is an apocalyptic number.

It is an amenable number.

916391640 is an abundant number, since it is smaller than the sum of its proper divisors (1832783640).

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

916391640 is a wasteful number, since it uses less digits than its factorization.

916391640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7636611 (or 7636607 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 916391640 is about 30271.9612843304. The cubic root of 916391640 is about 971.3156201265.

The spelling of 916391640 in words is "nine hundred sixteen million, three hundred ninety-one thousand, six hundred forty".