72776426 has 4 divisors (see below), whose sum is σ = 109164642. Its totient is φ = 36388212.

The previous prime is 72776423. The next prime is 72776443. The reversal of 72776426 is 62467727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62467727 = 7 ⋅8923961.

It can be written as a sum of positive squares in only one way, i.e., 49688401 + 23088025 = 7049^2 + 4805^2 .

It is not an unprimeable number, because it can be changed into a prime (72776423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18194105 + ... + 18194108.

Almost surely, 2^72776426 is an apocalyptic number.

72776426 is a deficient number, since it is larger than the sum of its proper divisors (36388216).

72776426 is a wasteful number, since it uses less digits than its factorization.

72776426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36388215.

The product of its digits is 197568, while the sum is 41.

The square root of 72776426 is about 8530.9100335193. The cubic root of 72776426 is about 417.5068204989.

The spelling of 72776426 in words is "seventy-two million, seven hundred seventy-six thousand, four hundred twenty-six".