677721720 has 64 divisors (see below), whose sum is σ = 2189567520. Its totient is φ = 166823424.

The previous prime is 677721713. The next prime is 677721727. The reversal of 677721720 is 27127776.

It is an interprime number because it is at equal distance from previous prime (677721713) and next prime (677721727).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (677721727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215659 + ... + 218778.

Almost surely, 2^677721720 is an apocalyptic number.

677721720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

677721720 is an abundant number, since it is smaller than the sum of its proper divisors (1511845800).

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

677721720 is a wasteful number, since it uses less digits than its factorization.

677721720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434464 (or 434460 counting only the distinct ones).

The product of its (nonzero) digits is 57624, while the sum is 39.

The square root of 677721720 is about 26033.0889446489. The cubic root of 677721720 is about 878.3827562715.

The spelling of 677721720 in words is "six hundred seventy-seven million, seven hundred twenty-one thousand, seven hundred twenty".