997770654 has 12 divisors (see below), whose sum is σ = 2161836456. Its totient is φ = 332590212.

The previous prime is 997770649. The next prime is 997770679. The reversal of 997770654 is 456077799.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 997770654.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27715834 + ... + 27715869.

It is an arithmetic number, because the mean of its divisors is an integer number (180153038).

Almost surely, 2^997770654 is an apocalyptic number.

997770654 is an abundant number, since it is smaller than the sum of its proper divisors (1164065802).

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

997770654 is a wasteful number, since it uses less digits than its factorization.

997770654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55431711 (or 55431708 counting only the distinct ones).

The product of its (nonzero) digits is 3333960, while the sum is 54.

The square root of 997770654 is about 31587.5078789068. The cubic root of 997770654 is about 999.2563317613.

The spelling of 997770654 in words is "nine hundred ninety-seven million, seven hundred seventy thousand, six hundred fifty-four".