40157420728 has 8 divisors (see below), whose sum is σ = 75295163880. Its totient is φ = 20078710360.

The previous prime is 40157420651. The next prime is 40157420747. The reversal of 40157420728 is 82702475104.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×40157420728² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2509838788 + ... + 2509838803.

It is an arithmetic number, because the mean of its divisors is an integer number (9411895485).

Almost surely, 2^40157420728 is an apocalyptic number.

It is an amenable number.

40157420728 is a deficient number, since it is larger than the sum of its proper divisors (35137743152).

40157420728 is a wasteful number, since it uses less digits than its factorization.

40157420728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5019677597 (or 5019677593 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 40.

The spelling of 40157420728 in words is "forty billion, one hundred fifty-seven million, four hundred twenty thousand, seven hundred twenty-eight".