774498640 has 20 divisors (see below), whose sum is σ = 1800709524. Its totient is φ = 309799424.

The previous prime is 774498629. The next prime is 774498643. The reversal of 774498640 is 46894477.

It can be written as a sum of positive squares in 2 ways, for example, as 134003776 + 640494864 = 11576^2 + 25308^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (774498643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4840537 + ... + 4840696.

Almost surely, 2^774498640 is an apocalyptic number.

It is an amenable number.

774498640 is an abundant number, since it is smaller than the sum of its proper divisors (1026210884).

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

774498640 is a wasteful number, since it uses less digits than its factorization.

774498640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9681246 (or 9681240 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 49.

The square root of 774498640 is about 27829.8156659364. The cubic root of 774498640 is about 918.3471583615.

The spelling of 774498640 in words is "seven hundred seventy-four million, four hundred ninety-eight thousand, six hundred forty".