72006156540 has 72 divisors (see below), whose sum is σ = 223498202928. Its totient is φ = 18755089920.

The previous prime is 72006156463. The next prime is 72006156559. The reversal of 72006156540 is 4565160027.

It is a happy number.

72006156540 is a `hidden beast` number, since 7 + 2 + 0 + 0 + 61 + 56 + 540 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 72006156495 and 72006156504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4643821 + ... + 4659300.

Almost surely, 2^72006156540 is an apocalyptic number.

It is an amenable number.

72006156540 is an abundant number, since it is smaller than the sum of its proper divisors (151492046388).

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

72006156540 is a wasteful number, since it uses less digits than its factorization.

72006156540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9303179 (or 9303174 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 72006156540 in words is "seventy-two billion, six million, one hundred fifty-six thousand, five hundred forty".