72417986 has 4 divisors (see below), whose sum is σ = 108626982. Its totient is φ = 36208992.

The previous prime is 72417967. The next prime is 72417997. The reversal of 72417986 is 68971427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68971427 = 7 ⋅9853061.

It can be written as a sum of positive squares in only one way, i.e., 62900761 + 9517225 = 7931^2 + 3085^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18104495 + ... + 18104498.

Almost surely, 2^72417986 is an apocalyptic number.

72417986 is a deficient number, since it is larger than the sum of its proper divisors (36208996).

72417986 is a wasteful number, since it uses less digits than its factorization.

72417986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36208995.

The product of its digits is 169344, while the sum is 44.

The square root of 72417986 is about 8509.8757922781. The cubic root of 72417986 is about 416.8202542769.

The spelling of 72417986 in words is "seventy-two million, four hundred seventeen thousand, nine hundred eighty-six".