40728356 has 6 divisors (see below), whose sum is σ = 71274630. Its totient is φ = 20364176.

The previous prime is 40728323. The next prime is 40728409. The reversal of 40728356 is 65382704.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 38812900 + 1915456 = 6230^2 + 1384^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5091041 + ... + 5091048.

It is an arithmetic number, because the mean of its divisors is an integer number (11879105).

Almost surely, 2^40728356 is an apocalyptic number.

It is an amenable number.

40728356 is a deficient number, since it is larger than the sum of its proper divisors (30546274).

40728356 is a wasteful number, since it uses less digits than its factorization.

40728356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10182093 (or 10182091 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 40728356 is about 6381.8771533147. The cubic root of 40728356 is about 344.0585014080.

The spelling of 40728356 in words is "forty million, seven hundred twenty-eight thousand, three hundred fifty-six".