72272402 has 4 divisors (see below), whose sum is σ = 108408606. Its totient is φ = 36136200.

The previous prime is 72272393. The next prime is 72272411. The reversal of 72272402 is 20427227.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20427227 = 1597 ⋅12791.

It is an interprime number because it is at equal distance from previous prime (72272393) and next prime (72272411).

It can be written as a sum of positive squares in only one way, i.e., 39450961 + 32821441 = 6281^2 + 5729^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18068099 + ... + 18068102.

Almost surely, 2^72272402 is an apocalyptic number.

72272402 is a deficient number, since it is larger than the sum of its proper divisors (36136204).

72272402 is a wasteful number, since it uses less digits than its factorization.

72272402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36136203.

The product of its (nonzero) digits is 3136, while the sum is 26.

The square root of 72272402 is about 8501.3176625744. The cubic root of 72272402 is about 416.5407515705.

Adding to 72272402 its reverse (20427227), we get a palindrome (92699629).

The spelling of 72272402 in words is "seventy-two million, two hundred seventy-two thousand, four hundred two".