72497143 has 4 divisors (see below), whose sum is σ = 74265408. Its totient is φ = 70728880.

The previous prime is 72497137. The next prime is 72497147. The reversal of 72497143 is 34179427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34179427 = 1823 ⋅18749.

It is a cyclic number.

It is not a de Polignac number, because 72497143 - 2⁵ = 72497111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72497147) 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, 884071 + ... + 884152.

It is an arithmetic number, because the mean of its divisors is an integer number (18566352).

Almost surely, 2^72497143 is an apocalyptic number.

72497143 is a deficient number, since it is larger than the sum of its proper divisors (1768265).

72497143 is a wasteful number, since it uses less digits than its factorization.

72497143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768264.

The product of its digits is 42336, while the sum is 37.

The square root of 72497143 is about 8514.5254124936. The cubic root of 72497143 is about 416.9720684345.

The spelling of 72497143 in words is "seventy-two million, four hundred ninety-seven thousand, one hundred forty-three".