74770778440 has 32 divisors (see below), whose sum is σ = 168273116280. Its totient is φ = 29901402112.

The previous prime is 74770778429. The next prime is 74770778461. The reversal of 74770778440 is 4487707747.

It can be written as a sum of positive squares in 4 ways, for example, as 45607019364 + 29163759076 = 213558^2 + 170774^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38809 + ... + 388648.

Almost surely, 2^74770778440 is an apocalyptic number.

It is an amenable number.

74770778440 is an abundant number, since it is smaller than the sum of its proper divisors (93502337840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

74770778440 is a wasteful number, since it uses less digits than its factorization.

74770778440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431841 (or 431837 counting only the distinct ones).

The product of its (nonzero) digits is 8605184, while the sum is 55.

The spelling of 74770778440 in words is "seventy-four billion, seven hundred seventy million, seven hundred seventy-eight thousand, four hundred forty".