72545402 has 4 divisors (see below), whose sum is σ = 108818106. Its totient is φ = 36272700.

The previous prime is 72545399. The next prime is 72545449. The reversal of 72545402 is 20454527.

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: 20454527 = 73 ⋅280199.

It can be written as a sum of positive squares in only one way, i.e., 62742241 + 9803161 = 7921^2 + 3131^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18136349 + ... + 18136352.

Almost surely, 2^72545402 is an apocalyptic number.

72545402 is a deficient number, since it is larger than the sum of its proper divisors (36272704).

72545402 is a wasteful number, since it uses less digits than its factorization.

72545402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36272703.

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 72545402 is about 8517.3588629340. The cubic root of 72545402 is about 417.0645695128.

Adding to 72545402 its reverse (20454527), we get a palindrome (92999929).

The spelling of 72545402 in words is "seventy-two million, five hundred forty-five thousand, four hundred two".