72026137 has 4 divisors (see below), whose sum is σ = 73558656. Its totient is φ = 70493620.

The previous prime is 72026077. The next prime is 72026147. The reversal of 72026137 is 73162027.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73162027 = 19 ⋅3850633.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72026137 is a prime.

It is a super-2 number, since 2×72026137² = 10375528822285538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72026147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 766189 + ... + 766282.

It is an arithmetic number, because the mean of its divisors is an integer number (18389664).

Almost surely, 2^72026137 is an apocalyptic number.

It is an amenable number.

72026137 is a deficient number, since it is larger than the sum of its proper divisors (1532519).

72026137 is a wasteful number, since it uses less digits than its factorization.

72026137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532518.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 72026137 is about 8486.8213719861. The cubic root of 72026137 is about 416.0670984748.

The spelling of 72026137 in words is "seventy-two million, twenty-six thousand, one hundred thirty-seven".