690724532 has 6 divisors (see below), whose sum is σ = 1208767938. Its totient is φ = 345362264.

The previous prime is 690724513. The next prime is 690724553. The reversal of 690724532 is 235427096.

It can be written as a sum of positive squares in only one way, i.e., 459502096 + 231222436 = 21436^2 + 15206^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86340563 + ... + 86340570.

It is an arithmetic number, because the mean of its divisors is an integer number (201461323).

Almost surely, 2^690724532 is an apocalyptic number.

It is an amenable number.

690724532 is a deficient number, since it is larger than the sum of its proper divisors (518043406).

690724532 is a wasteful number, since it uses less digits than its factorization.

690724532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172681137 (or 172681135 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 690724532 is about 26281.6386855919. The cubic root of 690724532 is about 883.9647771638.

The spelling of 690724532 in words is "six hundred ninety million, seven hundred twenty-four thousand, five hundred thirty-two".