72737642 has 4 divisors (see below), whose sum is σ = 109106466. Its totient is φ = 36368820.

The previous prime is 72737633. The next prime is 72737657. The reversal of 72737642 is 24673727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24673727 = 13 ⋅1897979.

It can be written as a sum of positive squares in only one way, i.e., 37442161 + 35295481 = 6119^2 + 5941^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72737596 and 72737605.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18184409 + ... + 18184412.

Almost surely, 2^72737642 is an apocalyptic number.

72737642 is a deficient number, since it is larger than the sum of its proper divisors (36368824).

72737642 is a wasteful number, since it uses less digits than its factorization.

72737642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36368823.

The product of its digits is 98784, while the sum is 38.

The square root of 72737642 is about 8528.6365850586. The cubic root of 72737642 is about 417.4326414333.

The spelling of 72737642 in words is "seventy-two million, seven hundred thirty-seven thousand, six hundred forty-two".