678497972 has 6 divisors (see below), whose sum is σ = 1187371458. Its totient is φ = 339248984.

The previous prime is 678497957. The next prime is 678497983. The reversal of 678497972 is 279794876.

It can be written as a sum of positive squares in only one way, i.e., 437813776 + 240684196 = 20924^2 + 15514^2 .

It is a super-2 number, since 2×678497972² = 920718996016225568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84812243 + ... + 84812250.

It is an arithmetic number, because the mean of its divisors is an integer number (197895243).

Almost surely, 2^678497972 is an apocalyptic number.

It is an amenable number.

678497972 is a deficient number, since it is larger than the sum of its proper divisors (508873486).

678497972 is a wasteful number, since it uses less digits than its factorization.

678497972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169624497 (or 169624495 counting only the distinct ones).

The product of its digits is 10668672, while the sum is 59.

The square root of 678497972 is about 26047.9936271491. The cubic root of 678497972 is about 878.7179903315.

The spelling of 678497972 in words is "six hundred seventy-eight million, four hundred ninety-seven thousand, nine hundred seventy-two".