40491680 has 48 divisors (see below), whose sum is σ = 96684840. Its totient is φ = 16023552.

The previous prime is 40491677. The next prime is 40491683. The reversal of 40491680 is 8619404.

It is an interprime number because it is at equal distance from previous prime (40491677) and next prime (40491683).

It can be written as a sum of positive squares in 4 ways, for example, as 31225744 + 9265936 = 5588^2 + 3044^2 .

It is a super-2 number, since 2×40491680² = 3279152298444800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (40491683) 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, 14216 + ... + 16824.

Almost surely, 2^40491680 is an apocalyptic number.

40491680 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40491680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48342420).

40491680 is an abundant number, since it is smaller than the sum of its proper divisors (56193160).

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

40491680 is a wasteful number, since it uses less digits than its factorization.

40491680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2721 (or 2713 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 40491680 is about 6363.3073161682. The cubic root of 40491680 is about 343.3907550506.

The spelling of 40491680 in words is "forty million, four hundred ninety-one thousand, six hundred eighty".