72778754 has 8 divisors (see below), whose sum is σ = 109238988. Its totient is φ = 36365760.

The previous prime is 72778729. The next prime is 72778807. The reversal of 72778754 is 45787727.

It can be written as a sum of positive squares in 2 ways, for example, as 72505225 + 273529 = 8515^2 + 523^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 72778699 and 72778708.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7667 + ... + 14294.

Almost surely, 2^72778754 is an apocalyptic number.

72778754 is a deficient number, since it is larger than the sum of its proper divisors (36460234).

72778754 is a wasteful number, since it uses less digits than its factorization.

72778754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23620.

The product of its digits is 768320, while the sum is 47.

The square root of 72778754 is about 8531.0464774258. The cubic root of 72778754 is about 417.5112722404.

The spelling of 72778754 in words is "seventy-two million, seven hundred seventy-eight thousand, seven hundred fifty-four".