689451950 has 72 divisors (see below), whose sum is σ = 1427580504. Its totient is φ = 247508800.

The previous prime is 689451947. The next prime is 689452007. The reversal of 689451950 is 59154986.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 689451895 and 689451904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 501464 + ... + 502836.

It is an arithmetic number, because the mean of its divisors is an integer number (19827507).

Almost surely, 2^689451950 is an apocalyptic number.

689451950 is an abundant number, since it is smaller than the sum of its proper divisors (738128554).

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

689451950 is a wasteful number, since it uses less digits than its factorization.

689451950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1490 (or 1474 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 47.

The square root of 689451950 is about 26257.4170473792. The cubic root of 689451950 is about 883.4215749828.

The spelling of 689451950 in words is "six hundred eighty-nine million, four hundred fifty-one thousand, nine hundred fifty".