697421556 has 96 divisors (see below), whose sum is σ = 1954606080. Its totient is φ = 213777792.

The previous prime is 697421531. The next prime is 697421563. The reversal of 697421556 is 655124796.

697421556 is a `hidden beast` number, since 6 + 9 + 74 + 21 + 556 = 666.

It is a super-2 number, since 2×697421556² = 972793653546922272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 444285 + ... + 445851.

It is an arithmetic number, because the mean of its divisors is an integer number (20360480).

Almost surely, 2^697421556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 697421556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (977303040).

697421556 is an abundant number, since it is smaller than the sum of its proper divisors (1257184524).

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

697421556 is a wasteful number, since it uses less digits than its factorization.

697421556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910 (or 1902 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 697421556 is about 26408.7401441265. The cubic root of 697421556 is about 886.8124648280.

It can be divided in two parts, 6 and 97421556, that multiplied together give a triangular number (584529336 = T₃₄₁₉₁).

The spelling of 697421556 in words is "six hundred ninety-seven million, four hundred twenty-one thousand, five hundred fifty-six".