40688428 has 18 divisors (see below), whose sum is σ = 78267308. Its totient is φ = 18494520.

The previous prime is 40688423. The next prime is 40688437. The reversal of 40688428 is 82488604.

It is a super-2 number, since 2×40688428² = 3311096346222368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40688423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 41550 + ... + 42517.

Almost surely, 2^40688428 is an apocalyptic number.

It is an amenable number.

40688428 is a deficient number, since it is larger than the sum of its proper divisors (37578880).

40688428 is a wasteful number, since it uses less digits than its factorization.

40688428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84093 (or 84080 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 40.

The square root of 40688428 is about 6378.7481530470. The cubic root of 40688428 is about 343.9460321864.

The spelling of 40688428 in words is "forty million, six hundred eighty-eight thousand, four hundred twenty-eight".