672991690 has 32 divisors (see below), whose sum is σ = 1432183680. Its totient is φ = 222782784.

The previous prime is 672991663. The next prime is 672991691. The reversal of 672991690 is 96199276.

It is a super-2 number, since 2×672991690² = 905835629618112200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (672991691) 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, 163732 + ... + 167791.

It is an arithmetic number, because the mean of its divisors is an integer number (44755740).

Almost surely, 2^672991690 is an apocalyptic number.

672991690 is an abundant number, since it is smaller than the sum of its proper divisors (759191990).

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

672991690 is a wasteful number, since it uses less digits than its factorization.

672991690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331566.

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 672991690 is about 25942.0833781715. The cubic root of 672991690 is about 876.3344818129.

The spelling of 672991690 in words is "six hundred seventy-two million, nine hundred ninety-one thousand, six hundred ninety".