73778751 has 18 divisors (see below), whose sum is σ = 107737448. Its totient is φ = 48650400.

The previous prime is 73778743. The next prime is 73778753. The reversal of 73778751 is 15787737.

It is not a de Polignac number, because 73778751 - 2³ = 73778743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73778697 and 73778706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73778753) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 316531 + ... + 316763.

Almost surely, 2^73778751 is an apocalyptic number.

73778751 is a deficient number, since it is larger than the sum of its proper divisors (33958697).

73778751 is a wasteful number, since it uses less digits than its factorization.

73778751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623 (or 387 counting only the distinct ones).

The product of its digits is 288120, while the sum is 45.

The square root of 73778751 is about 8589.4558034837. The cubic root of 73778751 is about 419.4148142915.

It can be divided in two parts, 73778 and 751, that added together give a square (74529 = 273²).

The spelling of 73778751 in words is "seventy-three million, seven hundred seventy-eight thousand, seven hundred fifty-one".